linux/scripts/checkpatch.pl
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   1#!/usr/bin/perl -w
   2# (c) 2001, Dave Jones. (the file handling bit)
   3# (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
   4# (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
   5# (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
   6# Licensed under the terms of the GNU GPL License version 2
   7
   8use strict;
   9
  10my $P = $0;
  11$P =~ s@.*/@@g;
  12
  13my $V = '0.32';
  14
  15use Getopt::Long qw(:config no_auto_abbrev);
  16
  17my $quiet = 0;
  18my $tree = 1;
  19my $chk_signoff = 1;
  20my $chk_patch = 1;
  21my $tst_only;
  22my $emacs = 0;
  23my $terse = 0;
  24my $file = 0;
  25my $check = 0;
  26my $summary = 1;
  27my $mailback = 0;
  28my $summary_file = 0;
  29my $show_types = 0;
  30my $root;
  31my %debug;
  32my %ignore_type = ();
  33my @ignore = ();
  34my $help = 0;
  35my $configuration_file = ".checkpatch.conf";
  36my $max_line_length = 80;
  37
  38sub help {
  39        my ($exitcode) = @_;
  40
  41        print << "EOM";
  42Usage: $P [OPTION]... [FILE]...
  43Version: $V
  44
  45Options:
  46  -q, --quiet                quiet
  47  --no-tree                  run without a kernel tree
  48  --no-signoff               do not check for 'Signed-off-by' line
  49  --patch                    treat FILE as patchfile (default)
  50  --emacs                    emacs compile window format
  51  --terse                    one line per report
  52  -f, --file                 treat FILE as regular source file
  53  --subjective, --strict     enable more subjective tests
  54  --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  55  --max-line-length=n        set the maximum line length, if exceeded, warn
  56  --show-types               show the message "types" in the output
  57  --root=PATH                PATH to the kernel tree root
  58  --no-summary               suppress the per-file summary
  59  --mailback                 only produce a report in case of warnings/errors
  60  --summary-file             include the filename in summary
  61  --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  62                             'values', 'possible', 'type', and 'attr' (default
  63                             is all off)
  64  --test-only=WORD           report only warnings/errors containing WORD
  65                             literally
  66  -h, --help, --version      display this help and exit
  67
  68When FILE is - read standard input.
  69EOM
  70
  71        exit($exitcode);
  72}
  73
  74my $conf = which_conf($configuration_file);
  75if (-f $conf) {
  76        my @conf_args;
  77        open(my $conffile, '<', "$conf")
  78            or warn "$P: Can't find a readable $configuration_file file $!\n";
  79
  80        while (<$conffile>) {
  81                my $line = $_;
  82
  83                $line =~ s/\s*\n?$//g;
  84                $line =~ s/^\s*//g;
  85                $line =~ s/\s+/ /g;
  86
  87                next if ($line =~ m/^\s*#/);
  88                next if ($line =~ m/^\s*$/);
  89
  90                my @words = split(" ", $line);
  91                foreach my $word (@words) {
  92                        last if ($word =~ m/^#/);
  93                        push (@conf_args, $word);
  94                }
  95        }
  96        close($conffile);
  97        unshift(@ARGV, @conf_args) if @conf_args;
  98}
  99
 100GetOptions(
 101        'q|quiet+'      => \$quiet,
 102        'tree!'         => \$tree,
 103        'signoff!'      => \$chk_signoff,
 104        'patch!'        => \$chk_patch,
 105        'emacs!'        => \$emacs,
 106        'terse!'        => \$terse,
 107        'f|file!'       => \$file,
 108        'subjective!'   => \$check,
 109        'strict!'       => \$check,
 110        'ignore=s'      => \@ignore,
 111        'show-types!'   => \$show_types,
 112        'max-line-length=i' => \$max_line_length,
 113        'root=s'        => \$root,
 114        'summary!'      => \$summary,
 115        'mailback!'     => \$mailback,
 116        'summary-file!' => \$summary_file,
 117
 118        'debug=s'       => \%debug,
 119        'test-only=s'   => \$tst_only,
 120        'h|help'        => \$help,
 121        'version'       => \$help
 122) or help(1);
 123
 124help(0) if ($help);
 125
 126my $exit = 0;
 127
 128if ($#ARGV < 0) {
 129        print "$P: no input files\n";
 130        exit(1);
 131}
 132
 133@ignore = split(/,/, join(',',@ignore));
 134foreach my $word (@ignore) {
 135        $word =~ s/\s*\n?$//g;
 136        $word =~ s/^\s*//g;
 137        $word =~ s/\s+/ /g;
 138        $word =~ tr/[a-z]/[A-Z]/;
 139
 140        next if ($word =~ m/^\s*#/);
 141        next if ($word =~ m/^\s*$/);
 142
 143        $ignore_type{$word}++;
 144}
 145
 146my $dbg_values = 0;
 147my $dbg_possible = 0;
 148my $dbg_type = 0;
 149my $dbg_attr = 0;
 150for my $key (keys %debug) {
 151        ## no critic
 152        eval "\${dbg_$key} = '$debug{$key}';";
 153        die "$@" if ($@);
 154}
 155
 156my $rpt_cleaners = 0;
 157
 158if ($terse) {
 159        $emacs = 1;
 160        $quiet++;
 161}
 162
 163if ($tree) {
 164        if (defined $root) {
 165                if (!top_of_kernel_tree($root)) {
 166                        die "$P: $root: --root does not point at a valid tree\n";
 167                }
 168        } else {
 169                if (top_of_kernel_tree('.')) {
 170                        $root = '.';
 171                } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 172                                                top_of_kernel_tree($1)) {
 173                        $root = $1;
 174                }
 175        }
 176
 177        if (!defined $root) {
 178                print "Must be run from the top-level dir. of a kernel tree\n";
 179                exit(2);
 180        }
 181}
 182
 183my $emitted_corrupt = 0;
 184
 185our $Ident      = qr{
 186                        [A-Za-z_][A-Za-z\d_]*
 187                        (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 188                }x;
 189our $Storage    = qr{extern|static|asmlinkage};
 190our $Sparse     = qr{
 191                        __user|
 192                        __kernel|
 193                        __force|
 194                        __iomem|
 195                        __must_check|
 196                        __init_refok|
 197                        __kprobes|
 198                        __ref|
 199                        __rcu
 200                }x;
 201
 202# Notes to $Attribute:
 203# We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
 204our $Attribute  = qr{
 205                        const|
 206                        __percpu|
 207                        __nocast|
 208                        __safe|
 209                        __bitwise__|
 210                        __packed__|
 211                        __packed2__|
 212                        __naked|
 213                        __maybe_unused|
 214                        __always_unused|
 215                        __noreturn|
 216                        __used|
 217                        __cold|
 218                        __noclone|
 219                        __deprecated|
 220                        __read_mostly|
 221                        __kprobes|
 222                        __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
 223                        ____cacheline_aligned|
 224                        ____cacheline_aligned_in_smp|
 225                        ____cacheline_internodealigned_in_smp|
 226                        __weak
 227                  }x;
 228our $Modifier;
 229our $Inline     = qr{inline|__always_inline|noinline};
 230our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 231our $Lval       = qr{$Ident(?:$Member)*};
 232
 233our $Float_hex  = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
 234our $Float_dec  = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
 235our $Float_int  = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
 236our $Float      = qr{$Float_hex|$Float_dec|$Float_int};
 237our $Constant   = qr{$Float|(?i)(?:0x[0-9a-f]+|[0-9]+)[ul]*};
 238our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
 239our $Compare    = qr{<=|>=|==|!=|<|>};
 240our $Operators  = qr{
 241                        <=|>=|==|!=|
 242                        =>|->|<<|>>|<|>|!|~|
 243                        &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
 244                  }x;
 245
 246our $NonptrType;
 247our $Type;
 248our $Declare;
 249
 250our $NON_ASCII_UTF8     = qr{
 251        [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
 252        |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 253        | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 254        |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 255        |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 256        | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 257        |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 258}x;
 259
 260our $UTF8       = qr{
 261        [\x09\x0A\x0D\x20-\x7E]              # ASCII
 262        | $NON_ASCII_UTF8
 263}x;
 264
 265our $typeTypedefs = qr{(?x:
 266        (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
 267        atomic_t
 268)};
 269
 270our $logFunctions = qr{(?x:
 271        printk(?:_ratelimited|_once|)|
 272        [a-z0-9]+_(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
 273        WARN(?:_RATELIMIT|_ONCE|)|
 274        panic|
 275        MODULE_[A-Z_]+
 276)};
 277
 278our $signature_tags = qr{(?xi:
 279        Signed-off-by:|
 280        Acked-by:|
 281        Tested-by:|
 282        Reviewed-by:|
 283        Reported-by:|
 284        To:|
 285        Cc:
 286)};
 287
 288our @typeList = (
 289        qr{void},
 290        qr{(?:unsigned\s+)?char},
 291        qr{(?:unsigned\s+)?short},
 292        qr{(?:unsigned\s+)?int},
 293        qr{(?:unsigned\s+)?long},
 294        qr{(?:unsigned\s+)?long\s+int},
 295        qr{(?:unsigned\s+)?long\s+long},
 296        qr{(?:unsigned\s+)?long\s+long\s+int},
 297        qr{unsigned},
 298        qr{float},
 299        qr{double},
 300        qr{bool},
 301        qr{struct\s+$Ident},
 302        qr{union\s+$Ident},
 303        qr{enum\s+$Ident},
 304        qr{${Ident}_t},
 305        qr{${Ident}_handler},
 306        qr{${Ident}_handler_fn},
 307);
 308our @modifierList = (
 309        qr{fastcall},
 310);
 311
 312our $allowed_asm_includes = qr{(?x:
 313        irq|
 314        memory
 315)};
 316# memory.h: ARM has a custom one
 317
 318sub build_types {
 319        my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 320        my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 321        $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
 322        $NonptrType     = qr{
 323                        (?:$Modifier\s+|const\s+)*
 324                        (?:
 325                                (?:typeof|__typeof__)\s*\([^\)]*\)|
 326                                (?:$typeTypedefs\b)|
 327                                (?:${all}\b)
 328                        )
 329                        (?:\s+$Modifier|\s+const)*
 330                  }x;
 331        $Type   = qr{
 332                        $NonptrType
 333                        (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*|\[\])+|(?:\s*\[\s*\])+)?
 334                        (?:\s+$Inline|\s+$Modifier)*
 335                  }x;
 336        $Declare        = qr{(?:$Storage\s+)?$Type};
 337}
 338build_types();
 339
 340
 341our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
 342
 343# Using $balanced_parens, $LvalOrFunc, or $FuncArg
 344# requires at least perl version v5.10.0
 345# Any use must be runtime checked with $^V
 346
 347our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
 348our $LvalOrFunc = qr{($Lval)\s*($balanced_parens{0,1})\s*};
 349our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};
 350
 351sub deparenthesize {
 352        my ($string) = @_;
 353        return "" if (!defined($string));
 354        $string =~ s@^\s*\(\s*@@g;
 355        $string =~ s@\s*\)\s*$@@g;
 356        $string =~ s@\s+@ @g;
 357        return $string;
 358}
 359
 360$chk_signoff = 0 if ($file);
 361
 362my @rawlines = ();
 363my @lines = ();
 364my $vname;
 365for my $filename (@ARGV) {
 366        my $FILE;
 367        if ($file) {
 368                open($FILE, '-|', "diff -u /dev/null $filename") ||
 369                        die "$P: $filename: diff failed - $!\n";
 370        } elsif ($filename eq '-') {
 371                open($FILE, '<&STDIN');
 372        } else {
 373                open($FILE, '<', "$filename") ||
 374                        die "$P: $filename: open failed - $!\n";
 375        }
 376        if ($filename eq '-') {
 377                $vname = 'Your patch';
 378        } else {
 379                $vname = $filename;
 380        }
 381        while (<$FILE>) {
 382                chomp;
 383                push(@rawlines, $_);
 384        }
 385        close($FILE);
 386        if (!process($filename)) {
 387                $exit = 1;
 388        }
 389        @rawlines = ();
 390        @lines = ();
 391}
 392
 393exit($exit);
 394
 395sub top_of_kernel_tree {
 396        my ($root) = @_;
 397
 398        my @tree_check = (
 399                "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
 400                "README", "Documentation", "arch", "include", "drivers",
 401                "fs", "init", "ipc", "kernel", "lib", "scripts",
 402        );
 403
 404        foreach my $check (@tree_check) {
 405                if (! -e $root . '/' . $check) {
 406                        return 0;
 407                }
 408        }
 409        return 1;
 410}
 411
 412sub parse_email {
 413        my ($formatted_email) = @_;
 414
 415        my $name = "";
 416        my $address = "";
 417        my $comment = "";
 418
 419        if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
 420                $name = $1;
 421                $address = $2;
 422                $comment = $3 if defined $3;
 423        } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
 424                $address = $1;
 425                $comment = $2 if defined $2;
 426        } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
 427                $address = $1;
 428                $comment = $2 if defined $2;
 429                $formatted_email =~ s/$address.*$//;
 430                $name = $formatted_email;
 431                $name =~ s/^\s+|\s+$//g;
 432                $name =~ s/^\"|\"$//g;
 433                # If there's a name left after stripping spaces and
 434                # leading quotes, and the address doesn't have both
 435                # leading and trailing angle brackets, the address
 436                # is invalid. ie:
 437                #   "joe smith joe@smith.com" bad
 438                #   "joe smith <joe@smith.com" bad
 439                if ($name ne "" && $address !~ /^<[^>]+>$/) {
 440                        $name = "";
 441                        $address = "";
 442                        $comment = "";
 443                }
 444        }
 445
 446        $name =~ s/^\s+|\s+$//g;
 447        $name =~ s/^\"|\"$//g;
 448        $address =~ s/^\s+|\s+$//g;
 449        $address =~ s/^\<|\>$//g;
 450
 451        if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 452                $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 453                $name = "\"$name\"";
 454        }
 455
 456        return ($name, $address, $comment);
 457}
 458
 459sub format_email {
 460        my ($name, $address) = @_;
 461
 462        my $formatted_email;
 463
 464        $name =~ s/^\s+|\s+$//g;
 465        $name =~ s/^\"|\"$//g;
 466        $address =~ s/^\s+|\s+$//g;
 467
 468        if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
 469                $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
 470                $name = "\"$name\"";
 471        }
 472
 473        if ("$name" eq "") {
 474                $formatted_email = "$address";
 475        } else {
 476                $formatted_email = "$name <$address>";
 477        }
 478
 479        return $formatted_email;
 480}
 481
 482sub which_conf {
 483        my ($conf) = @_;
 484
 485        foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
 486                if (-e "$path/$conf") {
 487                        return "$path/$conf";
 488                }
 489        }
 490
 491        return "";
 492}
 493
 494sub expand_tabs {
 495        my ($str) = @_;
 496
 497        my $res = '';
 498        my $n = 0;
 499        for my $c (split(//, $str)) {
 500                if ($c eq "\t") {
 501                        $res .= ' ';
 502                        $n++;
 503                        for (; ($n % 8) != 0; $n++) {
 504                                $res .= ' ';
 505                        }
 506                        next;
 507                }
 508                $res .= $c;
 509                $n++;
 510        }
 511
 512        return $res;
 513}
 514sub copy_spacing {
 515        (my $res = shift) =~ tr/\t/ /c;
 516        return $res;
 517}
 518
 519sub line_stats {
 520        my ($line) = @_;
 521
 522        # Drop the diff line leader and expand tabs
 523        $line =~ s/^.//;
 524        $line = expand_tabs($line);
 525
 526        # Pick the indent from the front of the line.
 527        my ($white) = ($line =~ /^(\s*)/);
 528
 529        return (length($line), length($white));
 530}
 531
 532my $sanitise_quote = '';
 533
 534sub sanitise_line_reset {
 535        my ($in_comment) = @_;
 536
 537        if ($in_comment) {
 538                $sanitise_quote = '*/';
 539        } else {
 540                $sanitise_quote = '';
 541        }
 542}
 543sub sanitise_line {
 544        my ($line) = @_;
 545
 546        my $res = '';
 547        my $l = '';
 548
 549        my $qlen = 0;
 550        my $off = 0;
 551        my $c;
 552
 553        # Always copy over the diff marker.
 554        $res = substr($line, 0, 1);
 555
 556        for ($off = 1; $off < length($line); $off++) {
 557                $c = substr($line, $off, 1);
 558
 559                # Comments we are wacking completly including the begin
 560                # and end, all to $;.
 561                if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 562                        $sanitise_quote = '*/';
 563
 564                        substr($res, $off, 2, "$;$;");
 565                        $off++;
 566                        next;
 567                }
 568                if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 569                        $sanitise_quote = '';
 570                        substr($res, $off, 2, "$;$;");
 571                        $off++;
 572                        next;
 573                }
 574                if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 575                        $sanitise_quote = '//';
 576
 577                        substr($res, $off, 2, $sanitise_quote);
 578                        $off++;
 579                        next;
 580                }
 581
 582                # A \ in a string means ignore the next character.
 583                if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 584                    $c eq "\\") {
 585                        substr($res, $off, 2, 'XX');
 586                        $off++;
 587                        next;
 588                }
 589                # Regular quotes.
 590                if ($c eq "'" || $c eq '"') {
 591                        if ($sanitise_quote eq '') {
 592                                $sanitise_quote = $c;
 593
 594                                substr($res, $off, 1, $c);
 595                                next;
 596                        } elsif ($sanitise_quote eq $c) {
 597                                $sanitise_quote = '';
 598                        }
 599                }
 600
 601                #print "c<$c> SQ<$sanitise_quote>\n";
 602                if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 603                        substr($res, $off, 1, $;);
 604                } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 605                        substr($res, $off, 1, $;);
 606                } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 607                        substr($res, $off, 1, 'X');
 608                } else {
 609                        substr($res, $off, 1, $c);
 610                }
 611        }
 612
 613        if ($sanitise_quote eq '//') {
 614                $sanitise_quote = '';
 615        }
 616
 617        # The pathname on a #include may be surrounded by '<' and '>'.
 618        if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 619                my $clean = 'X' x length($1);
 620                $res =~ s@\<.*\>@<$clean>@;
 621
 622        # The whole of a #error is a string.
 623        } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 624                my $clean = 'X' x length($1);
 625                $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 626        }
 627
 628        return $res;
 629}
 630
 631sub ctx_statement_block {
 632        my ($linenr, $remain, $off) = @_;
 633        my $line = $linenr - 1;
 634        my $blk = '';
 635        my $soff = $off;
 636        my $coff = $off - 1;
 637        my $coff_set = 0;
 638
 639        my $loff = 0;
 640
 641        my $type = '';
 642        my $level = 0;
 643        my @stack = ();
 644        my $p;
 645        my $c;
 646        my $len = 0;
 647
 648        my $remainder;
 649        while (1) {
 650                @stack = (['', 0]) if ($#stack == -1);
 651
 652                #warn "CSB: blk<$blk> remain<$remain>\n";
 653                # If we are about to drop off the end, pull in more
 654                # context.
 655                if ($off >= $len) {
 656                        for (; $remain > 0; $line++) {
 657                                last if (!defined $lines[$line]);
 658                                next if ($lines[$line] =~ /^-/);
 659                                $remain--;
 660                                $loff = $len;
 661                                $blk .= $lines[$line] . "\n";
 662                                $len = length($blk);
 663                                $line++;
 664                                last;
 665                        }
 666                        # Bail if there is no further context.
 667                        #warn "CSB: blk<$blk> off<$off> len<$len>\n";
 668                        if ($off >= $len) {
 669                                last;
 670                        }
 671                        if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
 672                                $level++;
 673                                $type = '#';
 674                        }
 675                }
 676                $p = $c;
 677                $c = substr($blk, $off, 1);
 678                $remainder = substr($blk, $off);
 679
 680                #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
 681
 682                # Handle nested #if/#else.
 683                if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
 684                        push(@stack, [ $type, $level ]);
 685                } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
 686                        ($type, $level) = @{$stack[$#stack - 1]};
 687                } elsif ($remainder =~ /^#\s*endif\b/) {
 688                        ($type, $level) = @{pop(@stack)};
 689                }
 690
 691                # Statement ends at the ';' or a close '}' at the
 692                # outermost level.
 693                if ($level == 0 && $c eq ';') {
 694                        last;
 695                }
 696
 697                # An else is really a conditional as long as its not else if
 698                if ($level == 0 && $coff_set == 0 &&
 699                                (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
 700                                $remainder =~ /^(else)(?:\s|{)/ &&
 701                                $remainder !~ /^else\s+if\b/) {
 702                        $coff = $off + length($1) - 1;
 703                        $coff_set = 1;
 704                        #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
 705                        #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
 706                }
 707
 708                if (($type eq '' || $type eq '(') && $c eq '(') {
 709                        $level++;
 710                        $type = '(';
 711                }
 712                if ($type eq '(' && $c eq ')') {
 713                        $level--;
 714                        $type = ($level != 0)? '(' : '';
 715
 716                        if ($level == 0 && $coff < $soff) {
 717                                $coff = $off;
 718                                $coff_set = 1;
 719                                #warn "CSB: mark coff<$coff>\n";
 720                        }
 721                }
 722                if (($type eq '' || $type eq '{') && $c eq '{') {
 723                        $level++;
 724                        $type = '{';
 725                }
 726                if ($type eq '{' && $c eq '}') {
 727                        $level--;
 728                        $type = ($level != 0)? '{' : '';
 729
 730                        if ($level == 0) {
 731                                if (substr($blk, $off + 1, 1) eq ';') {
 732                                        $off++;
 733                                }
 734                                last;
 735                        }
 736                }
 737                # Preprocessor commands end at the newline unless escaped.
 738                if ($type eq '#' && $c eq "\n" && $p ne "\\") {
 739                        $level--;
 740                        $type = '';
 741                        $off++;
 742                        last;
 743                }
 744                $off++;
 745        }
 746        # We are truly at the end, so shuffle to the next line.
 747        if ($off == $len) {
 748                $loff = $len + 1;
 749                $line++;
 750                $remain--;
 751        }
 752
 753        my $statement = substr($blk, $soff, $off - $soff + 1);
 754        my $condition = substr($blk, $soff, $coff - $soff + 1);
 755
 756        #warn "STATEMENT<$statement>\n";
 757        #warn "CONDITION<$condition>\n";
 758
 759        #print "coff<$coff> soff<$off> loff<$loff>\n";
 760
 761        return ($statement, $condition,
 762                        $line, $remain + 1, $off - $loff + 1, $level);
 763}
 764
 765sub statement_lines {
 766        my ($stmt) = @_;
 767
 768        # Strip the diff line prefixes and rip blank lines at start and end.
 769        $stmt =~ s/(^|\n)./$1/g;
 770        $stmt =~ s/^\s*//;
 771        $stmt =~ s/\s*$//;
 772
 773        my @stmt_lines = ($stmt =~ /\n/g);
 774
 775        return $#stmt_lines + 2;
 776}
 777
 778sub statement_rawlines {
 779        my ($stmt) = @_;
 780
 781        my @stmt_lines = ($stmt =~ /\n/g);
 782
 783        return $#stmt_lines + 2;
 784}
 785
 786sub statement_block_size {
 787        my ($stmt) = @_;
 788
 789        $stmt =~ s/(^|\n)./$1/g;
 790        $stmt =~ s/^\s*{//;
 791        $stmt =~ s/}\s*$//;
 792        $stmt =~ s/^\s*//;
 793        $stmt =~ s/\s*$//;
 794
 795        my @stmt_lines = ($stmt =~ /\n/g);
 796        my @stmt_statements = ($stmt =~ /;/g);
 797
 798        my $stmt_lines = $#stmt_lines + 2;
 799        my $stmt_statements = $#stmt_statements + 1;
 800
 801        if ($stmt_lines > $stmt_statements) {
 802                return $stmt_lines;
 803        } else {
 804                return $stmt_statements;
 805        }
 806}
 807
 808sub ctx_statement_full {
 809        my ($linenr, $remain, $off) = @_;
 810        my ($statement, $condition, $level);
 811
 812        my (@chunks);
 813
 814        # Grab the first conditional/block pair.
 815        ($statement, $condition, $linenr, $remain, $off, $level) =
 816                                ctx_statement_block($linenr, $remain, $off);
 817        #print "F: c<$condition> s<$statement> remain<$remain>\n";
 818        push(@chunks, [ $condition, $statement ]);
 819        if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
 820                return ($level, $linenr, @chunks);
 821        }
 822
 823        # Pull in the following conditional/block pairs and see if they
 824        # could continue the statement.
 825        for (;;) {
 826                ($statement, $condition, $linenr, $remain, $off, $level) =
 827                                ctx_statement_block($linenr, $remain, $off);
 828                #print "C: c<$condition> s<$statement> remain<$remain>\n";
 829                last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
 830                #print "C: push\n";
 831                push(@chunks, [ $condition, $statement ]);
 832        }
 833
 834        return ($level, $linenr, @chunks);
 835}
 836
 837sub ctx_block_get {
 838        my ($linenr, $remain, $outer, $open, $close, $off) = @_;
 839        my $line;
 840        my $start = $linenr - 1;
 841        my $blk = '';
 842        my @o;
 843        my @c;
 844        my @res = ();
 845
 846        my $level = 0;
 847        my @stack = ($level);
 848        for ($line = $start; $remain > 0; $line++) {
 849                next if ($rawlines[$line] =~ /^-/);
 850                $remain--;
 851
 852                $blk .= $rawlines[$line];
 853
 854                # Handle nested #if/#else.
 855                if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
 856                        push(@stack, $level);
 857                } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
 858                        $level = $stack[$#stack - 1];
 859                } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
 860                        $level = pop(@stack);
 861                }
 862
 863                foreach my $c (split(//, $lines[$line])) {
 864                        ##print "C<$c>L<$level><$open$close>O<$off>\n";
 865                        if ($off > 0) {
 866                                $off--;
 867                                next;
 868                        }
 869
 870                        if ($c eq $close && $level > 0) {
 871                                $level--;
 872                                last if ($level == 0);
 873                        } elsif ($c eq $open) {
 874                                $level++;
 875                        }
 876                }
 877
 878                if (!$outer || $level <= 1) {
 879                        push(@res, $rawlines[$line]);
 880                }
 881
 882                last if ($level == 0);
 883        }
 884
 885        return ($level, @res);
 886}
 887sub ctx_block_outer {
 888        my ($linenr, $remain) = @_;
 889
 890        my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
 891        return @r;
 892}
 893sub ctx_block {
 894        my ($linenr, $remain) = @_;
 895
 896        my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 897        return @r;
 898}
 899sub ctx_statement {
 900        my ($linenr, $remain, $off) = @_;
 901
 902        my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 903        return @r;
 904}
 905sub ctx_block_level {
 906        my ($linenr, $remain) = @_;
 907
 908        return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 909}
 910sub ctx_statement_level {
 911        my ($linenr, $remain, $off) = @_;
 912
 913        return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 914}
 915
 916sub ctx_locate_comment {
 917        my ($first_line, $end_line) = @_;
 918
 919        # Catch a comment on the end of the line itself.
 920        my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
 921        return $current_comment if (defined $current_comment);
 922
 923        # Look through the context and try and figure out if there is a
 924        # comment.
 925        my $in_comment = 0;
 926        $current_comment = '';
 927        for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
 928                my $line = $rawlines[$linenr - 1];
 929                #warn "           $line\n";
 930                if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
 931                        $in_comment = 1;
 932                }
 933                if ($line =~ m@/\*@) {
 934                        $in_comment = 1;
 935                }
 936                if (!$in_comment && $current_comment ne '') {
 937                        $current_comment = '';
 938                }
 939                $current_comment .= $line . "\n" if ($in_comment);
 940                if ($line =~ m@\*/@) {
 941                        $in_comment = 0;
 942                }
 943        }
 944
 945        chomp($current_comment);
 946        return($current_comment);
 947}
 948sub ctx_has_comment {
 949        my ($first_line, $end_line) = @_;
 950        my $cmt = ctx_locate_comment($first_line, $end_line);
 951
 952        ##print "LINE: $rawlines[$end_line - 1 ]\n";
 953        ##print "CMMT: $cmt\n";
 954
 955        return ($cmt ne '');
 956}
 957
 958sub raw_line {
 959        my ($linenr, $cnt) = @_;
 960
 961        my $offset = $linenr - 1;
 962        $cnt++;
 963
 964        my $line;
 965        while ($cnt) {
 966                $line = $rawlines[$offset++];
 967                next if (defined($line) && $line =~ /^-/);
 968                $cnt--;
 969        }
 970
 971        return $line;
 972}
 973
 974sub cat_vet {
 975        my ($vet) = @_;
 976        my ($res, $coded);
 977
 978        $res = '';
 979        while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
 980                $res .= $1;
 981                if ($2 ne '') {
 982                        $coded = sprintf("^%c", unpack('C', $2) + 64);
 983                        $res .= $coded;
 984                }
 985        }
 986        $res =~ s/$/\$/;
 987
 988        return $res;
 989}
 990
 991my $av_preprocessor = 0;
 992my $av_pending;
 993my @av_paren_type;
 994my $av_pend_colon;
 995
 996sub annotate_reset {
 997        $av_preprocessor = 0;
 998        $av_pending = '_';
 999        @av_paren_type = ('E');
1000        $av_pend_colon = 'O';
1001}
1002
1003sub annotate_values {
1004        my ($stream, $type) = @_;
1005
1006        my $res;
1007        my $var = '_' x length($stream);
1008        my $cur = $stream;
1009
1010        print "$stream\n" if ($dbg_values > 1);
1011
1012        while (length($cur)) {
1013                @av_paren_type = ('E') if ($#av_paren_type < 0);
1014                print " <" . join('', @av_paren_type) .
1015                                "> <$type> <$av_pending>" if ($dbg_values > 1);
1016                if ($cur =~ /^(\s+)/o) {
1017                        print "WS($1)\n" if ($dbg_values > 1);
1018                        if ($1 =~ /\n/ && $av_preprocessor) {
1019                                $type = pop(@av_paren_type);
1020                                $av_preprocessor = 0;
1021                        }
1022
1023                } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1024                        print "CAST($1)\n" if ($dbg_values > 1);
1025                        push(@av_paren_type, $type);
1026                        $type = 'c';
1027
1028                } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1029                        print "DECLARE($1)\n" if ($dbg_values > 1);
1030                        $type = 'T';
1031
1032                } elsif ($cur =~ /^($Modifier)\s*/) {
1033                        print "MODIFIER($1)\n" if ($dbg_values > 1);
1034                        $type = 'T';
1035
1036                } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1037                        print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1038                        $av_preprocessor = 1;
1039                        push(@av_paren_type, $type);
1040                        if ($2 ne '') {
1041                                $av_pending = 'N';
1042                        }
1043                        $type = 'E';
1044
1045                } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1046                        print "UNDEF($1)\n" if ($dbg_values > 1);
1047                        $av_preprocessor = 1;
1048                        push(@av_paren_type, $type);
1049
1050                } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1051                        print "PRE_START($1)\n" if ($dbg_values > 1);
1052                        $av_preprocessor = 1;
1053
1054                        push(@av_paren_type, $type);
1055                        push(@av_paren_type, $type);
1056                        $type = 'E';
1057
1058                } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1059                        print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1060                        $av_preprocessor = 1;
1061
1062                        push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1063
1064                        $type = 'E';
1065
1066                } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1067                        print "PRE_END($1)\n" if ($dbg_values > 1);
1068
1069                        $av_preprocessor = 1;
1070
1071                        # Assume all arms of the conditional end as this
1072                        # one does, and continue as if the #endif was not here.
1073                        pop(@av_paren_type);
1074                        push(@av_paren_type, $type);
1075                        $type = 'E';
1076
1077                } elsif ($cur =~ /^(\\\n)/o) {
1078                        print "PRECONT($1)\n" if ($dbg_values > 1);
1079
1080                } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1081                        print "ATTR($1)\n" if ($dbg_values > 1);
1082                        $av_pending = $type;
1083                        $type = 'N';
1084
1085                } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1086                        print "SIZEOF($1)\n" if ($dbg_values > 1);
1087                        if (defined $2) {
1088                                $av_pending = 'V';
1089                        }
1090                        $type = 'N';
1091
1092                } elsif ($cur =~ /^(if|while|for)\b/o) {
1093                        print "COND($1)\n" if ($dbg_values > 1);
1094                        $av_pending = 'E';
1095                        $type = 'N';
1096
1097                } elsif ($cur =~/^(case)/o) {
1098                        print "CASE($1)\n" if ($dbg_values > 1);
1099                        $av_pend_colon = 'C';
1100                        $type = 'N';
1101
1102                } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1103                        print "KEYWORD($1)\n" if ($dbg_values > 1);
1104                        $type = 'N';
1105
1106                } elsif ($cur =~ /^(\()/o) {
1107                        print "PAREN('$1')\n" if ($dbg_values > 1);
1108                        push(@av_paren_type, $av_pending);
1109                        $av_pending = '_';
1110                        $type = 'N';
1111
1112                } elsif ($cur =~ /^(\))/o) {
1113                        my $new_type = pop(@av_paren_type);
1114                        if ($new_type ne '_') {
1115                                $type = $new_type;
1116                                print "PAREN('$1') -> $type\n"
1117                                                        if ($dbg_values > 1);
1118                        } else {
1119                                print "PAREN('$1')\n" if ($dbg_values > 1);
1120                        }
1121
1122                } elsif ($cur =~ /^($Ident)\s*\(/o) {
1123                        print "FUNC($1)\n" if ($dbg_values > 1);
1124                        $type = 'V';
1125                        $av_pending = 'V';
1126
1127                } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1128                        if (defined $2 && $type eq 'C' || $type eq 'T') {
1129                                $av_pend_colon = 'B';
1130                        } elsif ($type eq 'E') {
1131                                $av_pend_colon = 'L';
1132                        }
1133                        print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1134                        $type = 'V';
1135
1136                } elsif ($cur =~ /^($Ident|$Constant)/o) {
1137                        print "IDENT($1)\n" if ($dbg_values > 1);
1138                        $type = 'V';
1139
1140                } elsif ($cur =~ /^($Assignment)/o) {
1141                        print "ASSIGN($1)\n" if ($dbg_values > 1);
1142                        $type = 'N';
1143
1144                } elsif ($cur =~/^(;|{|})/) {
1145                        print "END($1)\n" if ($dbg_values > 1);
1146                        $type = 'E';
1147                        $av_pend_colon = 'O';
1148
1149                } elsif ($cur =~/^(,)/) {
1150                        print "COMMA($1)\n" if ($dbg_values > 1);
1151                        $type = 'C';
1152
1153                } elsif ($cur =~ /^(\?)/o) {
1154                        print "QUESTION($1)\n" if ($dbg_values > 1);
1155                        $type = 'N';
1156
1157                } elsif ($cur =~ /^(:)/o) {
1158                        print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1159
1160                        substr($var, length($res), 1, $av_pend_colon);
1161                        if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1162                                $type = 'E';
1163                        } else {
1164                                $type = 'N';
1165                        }
1166                        $av_pend_colon = 'O';
1167
1168                } elsif ($cur =~ /^(\[)/o) {
1169                        print "CLOSE($1)\n" if ($dbg_values > 1);
1170                        $type = 'N';
1171
1172                } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1173                        my $variant;
1174
1175                        print "OPV($1)\n" if ($dbg_values > 1);
1176                        if ($type eq 'V') {
1177                                $variant = 'B';
1178                        } else {
1179                                $variant = 'U';
1180                        }
1181
1182                        substr($var, length($res), 1, $variant);
1183                        $type = 'N';
1184
1185                } elsif ($cur =~ /^($Operators)/o) {
1186                        print "OP($1)\n" if ($dbg_values > 1);
1187                        if ($1 ne '++' && $1 ne '--') {
1188                                $type = 'N';
1189                        }
1190
1191                } elsif ($cur =~ /(^.)/o) {
1192                        print "C($1)\n" if ($dbg_values > 1);
1193                }
1194                if (defined $1) {
1195                        $cur = substr($cur, length($1));
1196                        $res .= $type x length($1);
1197                }
1198        }
1199
1200        return ($res, $var);
1201}
1202
1203sub possible {
1204        my ($possible, $line) = @_;
1205        my $notPermitted = qr{(?:
1206                ^(?:
1207                        $Modifier|
1208                        $Storage|
1209                        $Type|
1210                        DEFINE_\S+
1211                )$|
1212                ^(?:
1213                        goto|
1214                        return|
1215                        case|
1216                        else|
1217                        asm|__asm__|
1218                        do|
1219                        \#|
1220                        \#\#|
1221                )(?:\s|$)|
1222                ^(?:typedef|struct|enum)\b
1223            )}x;
1224        warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1225        if ($possible !~ $notPermitted) {
1226                # Check for modifiers.
1227                $possible =~ s/\s*$Storage\s*//g;
1228                $possible =~ s/\s*$Sparse\s*//g;
1229                if ($possible =~ /^\s*$/) {
1230
1231                } elsif ($possible =~ /\s/) {
1232                        $possible =~ s/\s*$Type\s*//g;
1233                        for my $modifier (split(' ', $possible)) {
1234                                if ($modifier !~ $notPermitted) {
1235                                        warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1236                                        push(@modifierList, $modifier);
1237                                }
1238                        }
1239
1240                } else {
1241                        warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1242                        push(@typeList, $possible);
1243                }
1244                build_types();
1245        } else {
1246                warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1247        }
1248}
1249
1250my $prefix = '';
1251
1252sub show_type {
1253       return !defined $ignore_type{$_[0]};
1254}
1255
1256sub report {
1257        if (!show_type($_[1]) ||
1258            (defined $tst_only && $_[2] !~ /\Q$tst_only\E/)) {
1259                return 0;
1260        }
1261        my $line;
1262        if ($show_types) {
1263                $line = "$prefix$_[0]:$_[1]: $_[2]\n";
1264        } else {
1265                $line = "$prefix$_[0]: $_[2]\n";
1266        }
1267        $line = (split('\n', $line))[0] . "\n" if ($terse);
1268
1269        push(our @report, $line);
1270
1271        return 1;
1272}
1273sub report_dump {
1274        our @report;
1275}
1276
1277sub ERROR {
1278        if (report("ERROR", $_[0], $_[1])) {
1279                our $clean = 0;
1280                our $cnt_error++;
1281        }
1282}
1283sub WARN {
1284        if (report("WARNING", $_[0], $_[1])) {
1285                our $clean = 0;
1286                our $cnt_warn++;
1287        }
1288}
1289sub CHK {
1290        if ($check && report("CHECK", $_[0], $_[1])) {
1291                our $clean = 0;
1292                our $cnt_chk++;
1293        }
1294}
1295
1296sub check_absolute_file {
1297        my ($absolute, $herecurr) = @_;
1298        my $file = $absolute;
1299
1300        ##print "absolute<$absolute>\n";
1301
1302        # See if any suffix of this path is a path within the tree.
1303        while ($file =~ s@^[^/]*/@@) {
1304                if (-f "$root/$file") {
1305                        ##print "file<$file>\n";
1306                        last;
1307                }
1308        }
1309        if (! -f _)  {
1310                return 0;
1311        }
1312
1313        # It is, so see if the prefix is acceptable.
1314        my $prefix = $absolute;
1315        substr($prefix, -length($file)) = '';
1316
1317        ##print "prefix<$prefix>\n";
1318        if ($prefix ne ".../") {
1319                WARN("USE_RELATIVE_PATH",
1320                     "use relative pathname instead of absolute in changelog text\n" . $herecurr);
1321        }
1322}
1323
1324sub pos_last_openparen {
1325        my ($line) = @_;
1326
1327        my $pos = 0;
1328
1329        my $opens = $line =~ tr/\(/\(/;
1330        my $closes = $line =~ tr/\)/\)/;
1331
1332        my $last_openparen = 0;
1333
1334        if (($opens == 0) || ($closes >= $opens)) {
1335                return -1;
1336        }
1337
1338        my $len = length($line);
1339
1340        for ($pos = 0; $pos < $len; $pos++) {
1341                my $string = substr($line, $pos);
1342                if ($string =~ /^($FuncArg|$balanced_parens)/) {
1343                        $pos += length($1) - 1;
1344                } elsif (substr($line, $pos, 1) eq '(') {
1345                        $last_openparen = $pos;
1346                } elsif (index($string, '(') == -1) {
1347                        last;
1348                }
1349        }
1350
1351        return $last_openparen + 1;
1352}
1353
1354sub process {
1355        my $filename = shift;
1356
1357        my $linenr=0;
1358        my $prevline="";
1359        my $prevrawline="";
1360        my $stashline="";
1361        my $stashrawline="";
1362
1363        my $length;
1364        my $indent;
1365        my $previndent=0;
1366        my $stashindent=0;
1367
1368        our $clean = 1;
1369        my $signoff = 0;
1370        my $is_patch = 0;
1371
1372        my $in_header_lines = 1;
1373        my $in_commit_log = 0;          #Scanning lines before patch
1374
1375        my $non_utf8_charset = 0;
1376
1377        our @report = ();
1378        our $cnt_lines = 0;
1379        our $cnt_error = 0;
1380        our $cnt_warn = 0;
1381        our $cnt_chk = 0;
1382
1383        # Trace the real file/line as we go.
1384        my $realfile = '';
1385        my $realline = 0;
1386        my $realcnt = 0;
1387        my $here = '';
1388        my $in_comment = 0;
1389        my $comment_edge = 0;
1390        my $first_line = 0;
1391        my $p1_prefix = '';
1392
1393        my $prev_values = 'E';
1394
1395        # suppression flags
1396        my %suppress_ifbraces;
1397        my %suppress_whiletrailers;
1398        my %suppress_export;
1399        my $suppress_statement = 0;
1400
1401        my %camelcase = ();
1402
1403        # Pre-scan the patch sanitizing the lines.
1404        # Pre-scan the patch looking for any __setup documentation.
1405        #
1406        my @setup_docs = ();
1407        my $setup_docs = 0;
1408
1409        sanitise_line_reset();
1410        my $line;
1411        foreach my $rawline (@rawlines) {
1412                $linenr++;
1413                $line = $rawline;
1414
1415                if ($rawline=~/^\+\+\+\s+(\S+)/) {
1416                        $setup_docs = 0;
1417                        if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1418                                $setup_docs = 1;
1419                        }
1420                        #next;
1421                }
1422                if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1423                        $realline=$1-1;
1424                        if (defined $2) {
1425                                $realcnt=$3+1;
1426                        } else {
1427                                $realcnt=1+1;
1428                        }
1429                        $in_comment = 0;
1430
1431                        # Guestimate if this is a continuing comment.  Run
1432                        # the context looking for a comment "edge".  If this
1433                        # edge is a close comment then we must be in a comment
1434                        # at context start.
1435                        my $edge;
1436                        my $cnt = $realcnt;
1437                        for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1438                                next if (defined $rawlines[$ln - 1] &&
1439                                         $rawlines[$ln - 1] =~ /^-/);
1440                                $cnt--;
1441                                #print "RAW<$rawlines[$ln - 1]>\n";
1442                                last if (!defined $rawlines[$ln - 1]);
1443                                if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1444                                    $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1445                                        ($edge) = $1;
1446                                        last;
1447                                }
1448                        }
1449                        if (defined $edge && $edge eq '*/') {
1450                                $in_comment = 1;
1451                        }
1452
1453                        # Guestimate if this is a continuing comment.  If this
1454                        # is the start of a diff block and this line starts
1455                        # ' *' then it is very likely a comment.
1456                        if (!defined $edge &&
1457                            $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1458                        {
1459                                $in_comment = 1;
1460                        }
1461
1462                        ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1463                        sanitise_line_reset($in_comment);
1464
1465                } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1466                        # Standardise the strings and chars within the input to
1467                        # simplify matching -- only bother with positive lines.
1468                        $line = sanitise_line($rawline);
1469                }
1470                push(@lines, $line);
1471
1472                if ($realcnt > 1) {
1473                        $realcnt-- if ($line =~ /^(?:\+| |$)/);
1474                } else {
1475                        $realcnt = 0;
1476                }
1477
1478                #print "==>$rawline\n";
1479                #print "-->$line\n";
1480
1481                if ($setup_docs && $line =~ /^\+/) {
1482                        push(@setup_docs, $line);
1483                }
1484        }
1485
1486        $prefix = '';
1487
1488        $realcnt = 0;
1489        $linenr = 0;
1490        foreach my $line (@lines) {
1491                $linenr++;
1492
1493                my $rawline = $rawlines[$linenr - 1];
1494
1495#extract the line range in the file after the patch is applied
1496                if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1497                        $is_patch = 1;
1498                        $first_line = $linenr + 1;
1499                        $realline=$1-1;
1500                        if (defined $2) {
1501                                $realcnt=$3+1;
1502                        } else {
1503                                $realcnt=1+1;
1504                        }
1505                        annotate_reset();
1506                        $prev_values = 'E';
1507
1508                        %suppress_ifbraces = ();
1509                        %suppress_whiletrailers = ();
1510                        %suppress_export = ();
1511                        $suppress_statement = 0;
1512                        next;
1513
1514# track the line number as we move through the hunk, note that
1515# new versions of GNU diff omit the leading space on completely
1516# blank context lines so we need to count that too.
1517                } elsif ($line =~ /^( |\+|$)/) {
1518                        $realline++;
1519                        $realcnt-- if ($realcnt != 0);
1520
1521                        # Measure the line length and indent.
1522                        ($length, $indent) = line_stats($rawline);
1523
1524                        # Track the previous line.
1525                        ($prevline, $stashline) = ($stashline, $line);
1526                        ($previndent, $stashindent) = ($stashindent, $indent);
1527                        ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1528
1529                        #warn "line<$line>\n";
1530
1531                } elsif ($realcnt == 1) {
1532                        $realcnt--;
1533                }
1534
1535                my $hunk_line = ($realcnt != 0);
1536
1537#make up the handle for any error we report on this line
1538                $prefix = "$filename:$realline: " if ($emacs && $file);
1539                $prefix = "$filename:$linenr: " if ($emacs && !$file);
1540
1541                $here = "#$linenr: " if (!$file);
1542                $here = "#$realline: " if ($file);
1543
1544                # extract the filename as it passes
1545                if ($line =~ /^diff --git.*?(\S+)$/) {
1546                        $realfile = $1;
1547                        $realfile =~ s@^([^/]*)/@@;
1548                        $in_commit_log = 0;
1549                } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1550                        $realfile = $1;
1551                        $realfile =~ s@^([^/]*)/@@;
1552                        $in_commit_log = 0;
1553
1554                        $p1_prefix = $1;
1555                        if (!$file && $tree && $p1_prefix ne '' &&
1556                            -e "$root/$p1_prefix") {
1557                                WARN("PATCH_PREFIX",
1558                                     "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1559                        }
1560
1561                        if ($realfile =~ m@^include/asm/@) {
1562                                ERROR("MODIFIED_INCLUDE_ASM",
1563                                      "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
1564                        }
1565                        next;
1566                }
1567
1568                $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1569
1570                my $hereline = "$here\n$rawline\n";
1571                my $herecurr = "$here\n$rawline\n";
1572                my $hereprev = "$here\n$prevrawline\n$rawline\n";
1573
1574                $cnt_lines++ if ($realcnt != 0);
1575
1576# Check for incorrect file permissions
1577                if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1578                        my $permhere = $here . "FILE: $realfile\n";
1579                        if ($realfile =~ /(Makefile|Kconfig|\.c|\.h|\.S|\.tmpl)$/) {
1580                                ERROR("EXECUTE_PERMISSIONS",
1581                                      "do not set execute permissions for source files\n" . $permhere);
1582                        }
1583                }
1584
1585# Check the patch for a signoff:
1586                if ($line =~ /^\s*signed-off-by:/i) {
1587                        $signoff++;
1588                        $in_commit_log = 0;
1589                }
1590
1591# Check signature styles
1592                if (!$in_header_lines &&
1593                    $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
1594                        my $space_before = $1;
1595                        my $sign_off = $2;
1596                        my $space_after = $3;
1597                        my $email = $4;
1598                        my $ucfirst_sign_off = ucfirst(lc($sign_off));
1599
1600                        if ($sign_off !~ /$signature_tags/) {
1601                                WARN("BAD_SIGN_OFF",
1602                                     "Non-standard signature: $sign_off\n" . $herecurr);
1603                        }
1604                        if (defined $space_before && $space_before ne "") {
1605                                WARN("BAD_SIGN_OFF",
1606                                     "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr);
1607                        }
1608                        if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
1609                                WARN("BAD_SIGN_OFF",
1610                                     "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr);
1611                        }
1612                        if (!defined $space_after || $space_after ne " ") {
1613                                WARN("BAD_SIGN_OFF",
1614                                     "Use a single space after $ucfirst_sign_off\n" . $herecurr);
1615                        }
1616
1617                        my ($email_name, $email_address, $comment) = parse_email($email);
1618                        my $suggested_email = format_email(($email_name, $email_address));
1619                        if ($suggested_email eq "") {
1620                                ERROR("BAD_SIGN_OFF",
1621                                      "Unrecognized email address: '$email'\n" . $herecurr);
1622                        } else {
1623                                my $dequoted = $suggested_email;
1624                                $dequoted =~ s/^"//;
1625                                $dequoted =~ s/" </ </;
1626                                # Don't force email to have quotes
1627                                # Allow just an angle bracketed address
1628                                if ("$dequoted$comment" ne $email &&
1629                                    "<$email_address>$comment" ne $email &&
1630                                    "$suggested_email$comment" ne $email) {
1631                                        WARN("BAD_SIGN_OFF",
1632                                             "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
1633                                }
1634                        }
1635                }
1636
1637# Check for wrappage within a valid hunk of the file
1638                if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1639                        ERROR("CORRUPTED_PATCH",
1640                              "patch seems to be corrupt (line wrapped?)\n" .
1641                                $herecurr) if (!$emitted_corrupt++);
1642                }
1643
1644# Check for absolute kernel paths.
1645                if ($tree) {
1646                        while ($line =~ m{(?:^|\s)(/\S*)}g) {
1647                                my $file = $1;
1648
1649                                if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
1650                                    check_absolute_file($1, $herecurr)) {
1651                                        #
1652                                } else {
1653                                        check_absolute_file($file, $herecurr);
1654                                }
1655                        }
1656                }
1657
1658# UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1659                if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1660                    $rawline !~ m/^$UTF8*$/) {
1661                        my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1662
1663                        my $blank = copy_spacing($rawline);
1664                        my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1665                        my $hereptr = "$hereline$ptr\n";
1666
1667                        CHK("INVALID_UTF8",
1668                            "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1669                }
1670
1671# Check if it's the start of a commit log
1672# (not a header line and we haven't seen the patch filename)
1673                if ($in_header_lines && $realfile =~ /^$/ &&
1674                    $rawline !~ /^(commit\b|from\b|[\w-]+:).+$/i) {
1675                        $in_header_lines = 0;
1676                        $in_commit_log = 1;
1677                }
1678
1679# Check if there is UTF-8 in a commit log when a mail header has explicitly
1680# declined it, i.e defined some charset where it is missing.
1681                if ($in_header_lines &&
1682                    $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
1683                    $1 !~ /utf-8/i) {
1684                        $non_utf8_charset = 1;
1685                }
1686
1687                if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
1688                    $rawline =~ /$NON_ASCII_UTF8/) {
1689                        WARN("UTF8_BEFORE_PATCH",
1690                            "8-bit UTF-8 used in possible commit log\n" . $herecurr);
1691                }
1692
1693# ignore non-hunk lines and lines being removed
1694                next if (!$hunk_line || $line =~ /^-/);
1695
1696#trailing whitespace
1697                if ($line =~ /^\+.*\015/) {
1698                        my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1699                        ERROR("DOS_LINE_ENDINGS",
1700                              "DOS line endings\n" . $herevet);
1701
1702                } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1703                        my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1704                        ERROR("TRAILING_WHITESPACE",
1705                              "trailing whitespace\n" . $herevet);
1706                        $rpt_cleaners = 1;
1707                }
1708
1709# check for Kconfig help text having a real description
1710# Only applies when adding the entry originally, after that we do not have
1711# sufficient context to determine whether it is indeed long enough.
1712                if ($realfile =~ /Kconfig/ &&
1713                    $line =~ /.\s*config\s+/) {
1714                        my $length = 0;
1715                        my $cnt = $realcnt;
1716                        my $ln = $linenr + 1;
1717                        my $f;
1718                        my $is_start = 0;
1719                        my $is_end = 0;
1720                        for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
1721                                $f = $lines[$ln - 1];
1722                                $cnt-- if ($lines[$ln - 1] !~ /^-/);
1723                                $is_end = $lines[$ln - 1] =~ /^\+/;
1724
1725                                next if ($f =~ /^-/);
1726
1727                                if ($lines[$ln - 1] =~ /.\s*(?:bool|tristate)\s*\"/) {
1728                                        $is_start = 1;
1729                                } elsif ($lines[$ln - 1] =~ /.\s*(?:---)?help(?:---)?$/) {
1730                                        $length = -1;
1731                                }
1732
1733                                $f =~ s/^.//;
1734                                $f =~ s/#.*//;
1735                                $f =~ s/^\s+//;
1736                                next if ($f =~ /^$/);
1737                                if ($f =~ /^\s*config\s/) {
1738                                        $is_end = 1;
1739                                        last;
1740                                }
1741                                $length++;
1742                        }
1743                        WARN("CONFIG_DESCRIPTION",
1744                             "please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($is_start && $is_end && $length < 4);
1745                        #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
1746                }
1747
1748# discourage the addition of CONFIG_EXPERIMENTAL in Kconfig.
1749                if ($realfile =~ /Kconfig/ &&
1750                    $line =~ /.\s*depends on\s+.*\bEXPERIMENTAL\b/) {
1751                        WARN("CONFIG_EXPERIMENTAL",
1752                             "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
1753                }
1754
1755                if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
1756                    ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
1757                        my $flag = $1;
1758                        my $replacement = {
1759                                'EXTRA_AFLAGS' =>   'asflags-y',
1760                                'EXTRA_CFLAGS' =>   'ccflags-y',
1761                                'EXTRA_CPPFLAGS' => 'cppflags-y',
1762                                'EXTRA_LDFLAGS' =>  'ldflags-y',
1763                        };
1764
1765                        WARN("DEPRECATED_VARIABLE",
1766                             "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
1767                }
1768
1769# check we are in a valid source file if not then ignore this hunk
1770                next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
1771
1772#line length limit
1773                if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
1774                    $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
1775                    !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
1776                    $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1777                    $length > $max_line_length)
1778                {
1779                        WARN("LONG_LINE",
1780                             "line over $max_line_length characters\n" . $herecurr);
1781                }
1782
1783# Check for user-visible strings broken across lines, which breaks the ability
1784# to grep for the string.  Limited to strings used as parameters (those
1785# following an open parenthesis), which almost completely eliminates false
1786# positives, as well as warning only once per parameter rather than once per
1787# line of the string.  Make an exception when the previous string ends in a
1788# newline (multiple lines in one string constant) or \n\t (common in inline
1789# assembly to indent the instruction on the following line).
1790                if ($line =~ /^\+\s*"/ &&
1791                    $prevline =~ /"\s*$/ &&
1792                    $prevline =~ /\(/ &&
1793                    $prevrawline !~ /\\n(?:\\t)*"\s*$/) {
1794                        WARN("SPLIT_STRING",
1795                             "quoted string split across lines\n" . $hereprev);
1796                }
1797
1798# check for spaces before a quoted newline
1799                if ($rawline =~ /^.*\".*\s\\n/) {
1800                        WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
1801                             "unnecessary whitespace before a quoted newline\n" . $herecurr);
1802                }
1803
1804# check for adding lines without a newline.
1805                if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1806                        WARN("MISSING_EOF_NEWLINE",
1807                             "adding a line without newline at end of file\n" . $herecurr);
1808                }
1809
1810# Blackfin: use hi/lo macros
1811                if ($realfile =~ m@arch/blackfin/.*\.S$@) {
1812                        if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
1813                                my $herevet = "$here\n" . cat_vet($line) . "\n";
1814                                ERROR("LO_MACRO",
1815                                      "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
1816                        }
1817                        if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
1818                                my $herevet = "$here\n" . cat_vet($line) . "\n";
1819                                ERROR("HI_MACRO",
1820                                      "use the HI() macro, not (... >> 16)\n" . $herevet);
1821                        }
1822                }
1823
1824# check we are in a valid source file C or perl if not then ignore this hunk
1825                next if ($realfile !~ /\.(h|c|pl)$/);
1826
1827# at the beginning of a line any tabs must come first and anything
1828# more than 8 must use tabs.
1829                if ($rawline =~ /^\+\s* \t\s*\S/ ||
1830                    $rawline =~ /^\+\s*        \s*/) {
1831                        my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1832                        ERROR("CODE_INDENT",
1833                              "code indent should use tabs where possible\n" . $herevet);
1834                        $rpt_cleaners = 1;
1835                }
1836
1837# check for space before tabs.
1838                if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
1839                        my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1840                        WARN("SPACE_BEFORE_TAB",
1841                             "please, no space before tabs\n" . $herevet);
1842                }
1843
1844# check for && or || at the start of a line
1845                if ($rawline =~ /^\+\s*(&&|\|\|)/) {
1846                        CHK("LOGICAL_CONTINUATIONS",
1847                            "Logical continuations should be on the previous line\n" . $hereprev);
1848                }
1849
1850# check multi-line statement indentation matches previous line
1851                if ($^V && $^V ge 5.10.0 &&
1852                    $prevline =~ /^\+(\t*)(if \(|$Ident\().*(\&\&|\|\||,)\s*$/) {
1853                        $prevline =~ /^\+(\t*)(.*)$/;
1854                        my $oldindent = $1;
1855                        my $rest = $2;
1856
1857                        my $pos = pos_last_openparen($rest);
1858                        if ($pos >= 0) {
1859                                $line =~ /^(\+| )([ \t]*)/;
1860                                my $newindent = $2;
1861
1862                                my $goodtabindent = $oldindent .
1863                                        "\t" x ($pos / 8) .
1864                                        " "  x ($pos % 8);
1865                                my $goodspaceindent = $oldindent . " "  x $pos;
1866
1867                                if ($newindent ne $goodtabindent &&
1868                                    $newindent ne $goodspaceindent) {
1869                                        CHK("PARENTHESIS_ALIGNMENT",
1870                                            "Alignment should match open parenthesis\n" . $hereprev);
1871                                }
1872                        }
1873                }
1874
1875                if ($line =~ /^\+.*\*[ \t]*\)[ \t]+/) {
1876                        CHK("SPACING",
1877                            "No space is necessary after a cast\n" . $hereprev);
1878                }
1879
1880                if ($realfile =~ m@^(drivers/net/|net/)@ &&
1881                    $rawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&
1882                    $prevrawline =~ /^\+[ \t]*$/) {
1883                        WARN("NETWORKING_BLOCK_COMMENT_STYLE",
1884                             "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev);
1885                }
1886
1887                if ($realfile =~ m@^(drivers/net/|net/)@ &&
1888                    $rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&       #trailing */
1889                    $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&      #inline /*...*/
1890                    $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&       #trailing **/
1891                    $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {    #non blank */
1892                        WARN("NETWORKING_BLOCK_COMMENT_STYLE",
1893                             "networking block comments put the trailing */ on a separate line\n" . $herecurr);
1894                }
1895
1896# check for spaces at the beginning of a line.
1897# Exceptions:
1898#  1) within comments
1899#  2) indented preprocessor commands
1900#  3) hanging labels
1901                if ($rawline =~ /^\+ / && $line !~ /\+ *(?:$;|#|$Ident:)/)  {
1902                        my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1903                        WARN("LEADING_SPACE",
1904                             "please, no spaces at the start of a line\n" . $herevet);
1905                }
1906
1907# check we are in a valid C source file if not then ignore this hunk
1908                next if ($realfile !~ /\.(h|c)$/);
1909
1910# discourage the addition of CONFIG_EXPERIMENTAL in #if(def).
1911                if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) {
1912                        WARN("CONFIG_EXPERIMENTAL",
1913                             "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n");
1914                }
1915
1916# check for RCS/CVS revision markers
1917                if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
1918                        WARN("CVS_KEYWORD",
1919                             "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1920                }
1921
1922# Blackfin: don't use __builtin_bfin_[cs]sync
1923                if ($line =~ /__builtin_bfin_csync/) {
1924                        my $herevet = "$here\n" . cat_vet($line) . "\n";
1925                        ERROR("CSYNC",
1926                              "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
1927                }
1928                if ($line =~ /__builtin_bfin_ssync/) {
1929                        my $herevet = "$here\n" . cat_vet($line) . "\n";
1930                        ERROR("SSYNC",
1931                              "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
1932                }
1933
1934# check for old HOTPLUG __dev<foo> section markings
1935                if ($line =~ /\b(__dev(init|exit)(data|const|))\b/) {
1936                        WARN("HOTPLUG_SECTION",
1937                             "Using $1 is unnecessary\n" . $herecurr);
1938                }
1939
1940# Check for potential 'bare' types
1941                my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1942                    $realline_next);
1943#print "LINE<$line>\n";
1944                if ($linenr >= $suppress_statement &&
1945                    $realcnt && $line =~ /.\s*\S/) {
1946                        ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1947                                ctx_statement_block($linenr, $realcnt, 0);
1948                        $stat =~ s/\n./\n /g;
1949                        $cond =~ s/\n./\n /g;
1950
1951#print "linenr<$linenr> <$stat>\n";
1952                        # If this statement has no statement boundaries within
1953                        # it there is no point in retrying a statement scan
1954                        # until we hit end of it.
1955                        my $frag = $stat; $frag =~ s/;+\s*$//;
1956                        if ($frag !~ /(?:{|;)/) {
1957#print "skip<$line_nr_next>\n";
1958                                $suppress_statement = $line_nr_next;
1959                        }
1960
1961                        # Find the real next line.
1962                        $realline_next = $line_nr_next;
1963                        if (defined $realline_next &&
1964                            (!defined $lines[$realline_next - 1] ||
1965                             substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1966                                $realline_next++;
1967                        }
1968
1969                        my $s = $stat;
1970                        $s =~ s/{.*$//s;
1971
1972                        # Ignore goto labels.
1973                        if ($s =~ /$Ident:\*$/s) {
1974
1975                        # Ignore functions being called
1976                        } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1977
1978                        } elsif ($s =~ /^.\s*else\b/s) {
1979
1980                        # declarations always start with types
1981                        } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1982                                my $type = $1;
1983                                $type =~ s/\s+/ /g;
1984                                possible($type, "A:" . $s);
1985
1986                        # definitions in global scope can only start with types
1987                        } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1988                                possible($1, "B:" . $s);
1989                        }
1990
1991                        # any (foo ... *) is a pointer cast, and foo is a type
1992                        while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1993                                possible($1, "C:" . $s);
1994                        }
1995
1996                        # Check for any sort of function declaration.
1997                        # int foo(something bar, other baz);
1998                        # void (*store_gdt)(x86_descr_ptr *);
1999                        if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
2000                                my ($name_len) = length($1);
2001
2002                                my $ctx = $s;
2003                                substr($ctx, 0, $name_len + 1, '');
2004                                $ctx =~ s/\)[^\)]*$//;
2005
2006                                for my $arg (split(/\s*,\s*/, $ctx)) {
2007                                        if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
2008
2009                                                possible($1, "D:" . $s);
2010                                        }
2011                                }
2012                        }
2013
2014                }
2015
2016#
2017# Checks which may be anchored in the context.
2018#
2019
2020# Check for switch () and associated case and default
2021# statements should be at the same indent.
2022                if ($line=~/\bswitch\s*\(.*\)/) {
2023                        my $err = '';
2024                        my $sep = '';
2025                        my @ctx = ctx_block_outer($linenr, $realcnt);
2026                        shift(@ctx);
2027                        for my $ctx (@ctx) {
2028                                my ($clen, $cindent) = line_stats($ctx);
2029                                if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
2030                                                        $indent != $cindent) {
2031                                        $err .= "$sep$ctx\n";
2032                                        $sep = '';
2033                                } else {
2034                                        $sep = "[...]\n";
2035                                }
2036                        }
2037                        if ($err ne '') {
2038                                ERROR("SWITCH_CASE_INDENT_LEVEL",
2039                                      "switch and case should be at the same indent\n$hereline$err");
2040                        }
2041                }
2042
2043# if/while/etc brace do not go on next line, unless defining a do while loop,
2044# or if that brace on the next line is for something else
2045                if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
2046                        my $pre_ctx = "$1$2";
2047
2048                        my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
2049
2050                        if ($line =~ /^\+\t{6,}/) {
2051                                WARN("DEEP_INDENTATION",
2052                                     "Too many leading tabs - consider code refactoring\n" . $herecurr);
2053                        }
2054
2055                        my $ctx_cnt = $realcnt - $#ctx - 1;
2056                        my $ctx = join("\n", @ctx);
2057
2058                        my $ctx_ln = $linenr;
2059                        my $ctx_skip = $realcnt;
2060
2061                        while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
2062                                        defined $lines[$ctx_ln - 1] &&
2063                                        $lines[$ctx_ln - 1] =~ /^-/)) {
2064                                ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
2065                                $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
2066                                $ctx_ln++;
2067                        }
2068
2069                        #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
2070                        #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
2071
2072                        if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
2073                                ERROR("OPEN_BRACE",
2074                                      "that open brace { should be on the previous line\n" .
2075                                        "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2076                        }
2077                        if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
2078                            $ctx =~ /\)\s*\;\s*$/ &&
2079                            defined $lines[$ctx_ln - 1])
2080                        {
2081                                my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
2082                                if ($nindent > $indent) {
2083                                        WARN("TRAILING_SEMICOLON",
2084                                             "trailing semicolon indicates no statements, indent implies otherwise\n" .
2085                                                "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
2086                                }
2087                        }
2088                }
2089
2090# Check relative indent for conditionals and blocks.
2091                if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
2092                        ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2093                                ctx_statement_block($linenr, $realcnt, 0)
2094                                        if (!defined $stat);
2095                        my ($s, $c) = ($stat, $cond);
2096
2097                        substr($s, 0, length($c), '');
2098
2099                        # Make sure we remove the line prefixes as we have
2100                        # none on the first line, and are going to readd them
2101                        # where necessary.
2102                        $s =~ s/\n./\n/gs;
2103
2104                        # Find out how long the conditional actually is.
2105                        my @newlines = ($c =~ /\n/gs);
2106                        my $cond_lines = 1 + $#newlines;
2107
2108                        # We want to check the first line inside the block
2109                        # starting at the end of the conditional, so remove:
2110                        #  1) any blank line termination
2111                        #  2) any opening brace { on end of the line
2112                        #  3) any do (...) {
2113                        my $continuation = 0;
2114                        my $check = 0;
2115                        $s =~ s/^.*\bdo\b//;
2116                        $s =~ s/^\s*{//;
2117                        if ($s =~ s/^\s*\\//) {
2118                                $continuation = 1;
2119                        }
2120                        if ($s =~ s/^\s*?\n//) {
2121                                $check = 1;
2122                                $cond_lines++;
2123                        }
2124
2125                        # Also ignore a loop construct at the end of a
2126                        # preprocessor statement.
2127                        if (($prevline =~ /^.\s*#\s*define\s/ ||
2128                            $prevline =~ /\\\s*$/) && $continuation == 0) {
2129                                $check = 0;
2130                        }
2131
2132                        my $cond_ptr = -1;
2133                        $continuation = 0;
2134                        while ($cond_ptr != $cond_lines) {
2135                                $cond_ptr = $cond_lines;
2136
2137                                # If we see an #else/#elif then the code
2138                                # is not linear.
2139                                if ($s =~ /^\s*\#\s*(?:else|elif)/) {
2140                                        $check = 0;
2141                                }
2142
2143                                # Ignore:
2144                                #  1) blank lines, they should be at 0,
2145                                #  2) preprocessor lines, and
2146                                #  3) labels.
2147                                if ($continuation ||
2148                                    $s =~ /^\s*?\n/ ||
2149                                    $s =~ /^\s*#\s*?/ ||
2150                                    $s =~ /^\s*$Ident\s*:/) {
2151                                        $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
2152                                        if ($s =~ s/^.*?\n//) {
2153                                                $cond_lines++;
2154                                        }
2155                                }
2156                        }
2157
2158                        my (undef, $sindent) = line_stats("+" . $s);
2159                        my $stat_real = raw_line($linenr, $cond_lines);
2160
2161                        # Check if either of these lines are modified, else
2162                        # this is not this patch's fault.
2163                        if (!defined($stat_real) ||
2164                            $stat !~ /^\+/ && $stat_real !~ /^\+/) {
2165                                $check = 0;
2166                        }
2167                        if (defined($stat_real) && $cond_lines > 1) {
2168                                $stat_real = "[...]\n$stat_real";
2169                        }
2170
2171                        #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
2172
2173                        if ($check && (($sindent % 8) != 0 ||
2174                            ($sindent <= $indent && $s ne ''))) {
2175                                WARN("SUSPECT_CODE_INDENT",
2176                                     "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
2177                        }
2178                }
2179
2180                # Track the 'values' across context and added lines.
2181                my $opline = $line; $opline =~ s/^./ /;
2182                my ($curr_values, $curr_vars) =
2183                                annotate_values($opline . "\n", $prev_values);
2184                $curr_values = $prev_values . $curr_values;
2185                if ($dbg_values) {
2186                        my $outline = $opline; $outline =~ s/\t/ /g;
2187                        print "$linenr > .$outline\n";
2188                        print "$linenr > $curr_values\n";
2189                        print "$linenr >  $curr_vars\n";
2190                }
2191                $prev_values = substr($curr_values, -1);
2192
2193#ignore lines not being added
2194                if ($line=~/^[^\+]/) {next;}
2195
2196# TEST: allow direct testing of the type matcher.
2197                if ($dbg_type) {
2198                        if ($line =~ /^.\s*$Declare\s*$/) {
2199                                ERROR("TEST_TYPE",
2200                                      "TEST: is type\n" . $herecurr);
2201                        } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
2202                                ERROR("TEST_NOT_TYPE",
2203                                      "TEST: is not type ($1 is)\n". $herecurr);
2204                        }
2205                        next;
2206                }
2207# TEST: allow direct testing of the attribute matcher.
2208                if ($dbg_attr) {
2209                        if ($line =~ /^.\s*$Modifier\s*$/) {
2210                                ERROR("TEST_ATTR",
2211                                      "TEST: is attr\n" . $herecurr);
2212                        } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
2213                                ERROR("TEST_NOT_ATTR",
2214                                      "TEST: is not attr ($1 is)\n". $herecurr);
2215                        }
2216                        next;
2217                }
2218
2219# check for initialisation to aggregates open brace on the next line
2220                if ($line =~ /^.\s*{/ &&
2221                    $prevline =~ /(?:^|[^=])=\s*$/) {
2222                        ERROR("OPEN_BRACE",
2223                              "that open brace { should be on the previous line\n" . $hereprev);
2224                }
2225
2226#
2227# Checks which are anchored on the added line.
2228#
2229
2230# check for malformed paths in #include statements (uses RAW line)
2231                if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
2232                        my $path = $1;
2233                        if ($path =~ m{//}) {
2234                                ERROR("MALFORMED_INCLUDE",
2235                                      "malformed #include filename\n" . $herecurr);
2236                        }
2237                        if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
2238                                ERROR("UAPI_INCLUDE",
2239                                      "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
2240                        }
2241                }
2242
2243# no C99 // comments
2244                if ($line =~ m{//}) {
2245                        ERROR("C99_COMMENTS",
2246                              "do not use C99 // comments\n" . $herecurr);
2247                }
2248                # Remove C99 comments.
2249                $line =~ s@//.*@@;
2250                $opline =~ s@//.*@@;
2251
2252# EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
2253# the whole statement.
2254#print "APW <$lines[$realline_next - 1]>\n";
2255                if (defined $realline_next &&
2256                    exists $lines[$realline_next - 1] &&
2257                    !defined $suppress_export{$realline_next} &&
2258                    ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2259                     $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2260                        # Handle definitions which produce identifiers with
2261                        # a prefix:
2262                        #   XXX(foo);
2263                        #   EXPORT_SYMBOL(something_foo);
2264                        my $name = $1;
2265                        if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
2266                            $name =~ /^${Ident}_$2/) {
2267#print "FOO C name<$name>\n";
2268                                $suppress_export{$realline_next} = 1;
2269
2270                        } elsif ($stat !~ /(?:
2271                                \n.}\s*$|
2272                                ^.DEFINE_$Ident\(\Q$name\E\)|
2273                                ^.DECLARE_$Ident\(\Q$name\E\)|
2274                                ^.LIST_HEAD\(\Q$name\E\)|
2275                                ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
2276                                \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
2277                            )/x) {
2278#print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
2279                                $suppress_export{$realline_next} = 2;
2280                        } else {
2281                                $suppress_export{$realline_next} = 1;
2282                        }
2283                }
2284                if (!defined $suppress_export{$linenr} &&
2285                    $prevline =~ /^.\s*$/ &&
2286                    ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2287                     $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2288#print "FOO B <$lines[$linenr - 1]>\n";
2289                        $suppress_export{$linenr} = 2;
2290                }
2291                if (defined $suppress_export{$linenr} &&
2292                    $suppress_export{$linenr} == 2) {
2293                        WARN("EXPORT_SYMBOL",
2294                             "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
2295                }
2296
2297# check for global initialisers.
2298                if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
2299                        ERROR("GLOBAL_INITIALISERS",
2300                              "do not initialise globals to 0 or NULL\n" .
2301                                $herecurr);
2302                }
2303# check for static initialisers.
2304                if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
2305                        ERROR("INITIALISED_STATIC",
2306                              "do not initialise statics to 0 or NULL\n" .
2307                                $herecurr);
2308                }
2309
2310# check for static const char * arrays.
2311                if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
2312                        WARN("STATIC_CONST_CHAR_ARRAY",
2313                             "static const char * array should probably be static const char * const\n" .
2314                                $herecurr);
2315               }
2316
2317# check for static char foo[] = "bar" declarations.
2318                if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
2319                        WARN("STATIC_CONST_CHAR_ARRAY",
2320                             "static char array declaration should probably be static const char\n" .
2321                                $herecurr);
2322               }
2323
2324# check for declarations of struct pci_device_id
2325                if ($line =~ /\bstruct\s+pci_device_id\s+\w+\s*\[\s*\]\s*\=\s*\{/) {
2326                        WARN("DEFINE_PCI_DEVICE_TABLE",
2327                             "Use DEFINE_PCI_DEVICE_TABLE for struct pci_device_id\n" . $herecurr);
2328                }
2329
2330# check for new typedefs, only function parameters and sparse annotations
2331# make sense.
2332                if ($line =~ /\btypedef\s/ &&
2333                    $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
2334                    $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
2335                    $line !~ /\b$typeTypedefs\b/ &&
2336                    $line !~ /\b__bitwise(?:__|)\b/) {
2337                        WARN("NEW_TYPEDEFS",
2338                             "do not add new typedefs\n" . $herecurr);
2339                }
2340
2341# * goes on variable not on type
2342                # (char*[ const])
2343                while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
2344                        #print "AA<$1>\n";
2345                        my ($from, $to) = ($2, $2);
2346
2347                        # Should start with a space.
2348                        $to =~ s/^(\S)/ $1/;
2349                        # Should not end with a space.
2350                        $to =~ s/\s+$//;
2351                        # '*'s should not have spaces between.
2352                        while ($to =~ s/\*\s+\*/\*\*/) {
2353                        }
2354
2355                        #print "from<$from> to<$to>\n";
2356                        if ($from ne $to) {
2357                                ERROR("POINTER_LOCATION",
2358                                      "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
2359                        }
2360                }
2361                while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
2362                        #print "BB<$1>\n";
2363                        my ($from, $to, $ident) = ($2, $2, $3);
2364
2365                        # Should start with a space.
2366                        $to =~ s/^(\S)/ $1/;
2367                        # Should not end with a space.
2368                        $to =~ s/\s+$//;
2369                        # '*'s should not have spaces between.
2370                        while ($to =~ s/\*\s+\*/\*\*/) {
2371                        }
2372                        # Modifiers should have spaces.
2373                        $to =~ s/(\b$Modifier$)/$1 /;
2374
2375                        #print "from<$from> to<$to> ident<$ident>\n";
2376                        if ($from ne $to && $ident !~ /^$Modifier$/) {
2377                                ERROR("POINTER_LOCATION",
2378                                      "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
2379                        }
2380                }
2381
2382# # no BUG() or BUG_ON()
2383#               if ($line =~ /\b(BUG|BUG_ON)\b/) {
2384#                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
2385#                       print "$herecurr";
2386#                       $clean = 0;
2387#               }
2388
2389                if ($line =~ /\bLINUX_VERSION_CODE\b/) {
2390                        WARN("LINUX_VERSION_CODE",
2391                             "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
2392                }
2393
2394# check for uses of printk_ratelimit
2395                if ($line =~ /\bprintk_ratelimit\s*\(/) {
2396                        WARN("PRINTK_RATELIMITED",
2397"Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
2398                }
2399
2400# printk should use KERN_* levels.  Note that follow on printk's on the
2401# same line do not need a level, so we use the current block context
2402# to try and find and validate the current printk.  In summary the current
2403# printk includes all preceding printk's which have no newline on the end.
2404# we assume the first bad printk is the one to report.
2405                if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
2406                        my $ok = 0;
2407                        for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
2408                                #print "CHECK<$lines[$ln - 1]\n";
2409                                # we have a preceding printk if it ends
2410                                # with "\n" ignore it, else it is to blame
2411                                if ($lines[$ln - 1] =~ m{\bprintk\(}) {
2412                                        if ($rawlines[$ln - 1] !~ m{\\n"}) {
2413                                                $ok = 1;
2414                                        }
2415                                        last;
2416                                }
2417                        }
2418                        if ($ok == 0) {
2419                                WARN("PRINTK_WITHOUT_KERN_LEVEL",
2420                                     "printk() should include KERN_ facility level\n" . $herecurr);
2421                        }
2422                }
2423
2424                if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
2425                        my $orig = $1;
2426                        my $level = lc($orig);
2427                        $level = "warn" if ($level eq "warning");
2428                        my $level2 = $level;
2429                        $level2 = "dbg" if ($level eq "debug");
2430                        WARN("PREFER_PR_LEVEL",
2431                             "Prefer netdev_$level2(netdev, ... then dev_$level2(dev, ... then pr_$level(...  to printk(KERN_$orig ...\n" . $herecurr);
2432                }
2433
2434                if ($line =~ /\bpr_warning\s*\(/) {
2435                        WARN("PREFER_PR_LEVEL",
2436                             "Prefer pr_warn(... to pr_warning(...\n" . $herecurr);
2437                }
2438
2439                if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
2440                        my $orig = $1;
2441                        my $level = lc($orig);
2442                        $level = "warn" if ($level eq "warning");
2443                        $level = "dbg" if ($level eq "debug");
2444                        WARN("PREFER_DEV_LEVEL",
2445                             "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr);
2446                }
2447
2448# function brace can't be on same line, except for #defines of do while,
2449# or if closed on same line
2450                if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
2451                    !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
2452                        ERROR("OPEN_BRACE",
2453                              "open brace '{' following function declarations go on the next line\n" . $herecurr);
2454                }
2455
2456# open braces for enum, union and struct go on the same line.
2457                if ($line =~ /^.\s*{/ &&
2458                    $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
2459                        ERROR("OPEN_BRACE",
2460                              "open brace '{' following $1 go on the same line\n" . $hereprev);
2461                }
2462
2463# missing space after union, struct or enum definition
2464                if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
2465                    WARN("SPACING",
2466                         "missing space after $1 definition\n" . $herecurr);
2467                }
2468
2469# check for spacing round square brackets; allowed:
2470#  1. with a type on the left -- int [] a;
2471#  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
2472#  3. inside a curly brace -- = { [0...10] = 5 }
2473                while ($line =~ /(.*?\s)\[/g) {
2474                        my ($where, $prefix) = ($-[1], $1);
2475                        if ($prefix !~ /$Type\s+$/ &&
2476                            ($where != 0 || $prefix !~ /^.\s+$/) &&
2477                            $prefix !~ /[{,]\s+$/) {
2478                                ERROR("BRACKET_SPACE",
2479                                      "space prohibited before open square bracket '['\n" . $herecurr);
2480                        }
2481                }
2482
2483# check for spaces between functions and their parentheses.
2484                while ($line =~ /($Ident)\s+\(/g) {
2485                        my $name = $1;
2486                        my $ctx_before = substr($line, 0, $-[1]);
2487                        my $ctx = "$ctx_before$name";
2488
2489                        # Ignore those directives where spaces _are_ permitted.
2490                        if ($name =~ /^(?:
2491                                if|for|while|switch|return|case|
2492                                volatile|__volatile__|
2493                                __attribute__|format|__extension__|
2494                                asm|__asm__)$/x)
2495                        {
2496
2497                        # cpp #define statements have non-optional spaces, ie
2498                        # if there is a space between the name and the open
2499                        # parenthesis it is simply not a parameter group.
2500                        } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
2501
2502                        # cpp #elif statement condition may start with a (
2503                        } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
2504
2505                        # If this whole things ends with a type its most
2506                        # likely a typedef for a function.
2507                        } elsif ($ctx =~ /$Type$/) {
2508
2509                        } else {
2510                                WARN("SPACING",
2511                                     "space prohibited between function name and open parenthesis '('\n" . $herecurr);
2512                        }
2513                }
2514
2515# check for whitespace before a non-naked semicolon
2516                if ($line =~ /^\+.*\S\s+;/) {
2517                        CHK("SPACING",
2518                            "space prohibited before semicolon\n" . $herecurr);
2519                }
2520
2521# Check operator spacing.
2522                if (!($line=~/\#\s*include/)) {
2523                        my $ops = qr{
2524                                <<=|>>=|<=|>=|==|!=|
2525                                \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2526                                =>|->|<<|>>|<|>|=|!|~|
2527                                &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2528                                \?|:
2529                        }x;
2530                        my @elements = split(/($ops|;)/, $opline);
2531                        my $off = 0;
2532
2533                        my $blank = copy_spacing($opline);
2534
2535                        for (my $n = 0; $n < $#elements; $n += 2) {
2536                                $off += length($elements[$n]);
2537
2538                                # Pick up the preceding and succeeding characters.
2539                                my $ca = substr($opline, 0, $off);
2540                                my $cc = '';
2541                                if (length($opline) >= ($off + length($elements[$n + 1]))) {
2542                                        $cc = substr($opline, $off + length($elements[$n + 1]));
2543                                }
2544                                my $cb = "$ca$;$cc";
2545
2546                                my $a = '';
2547                                $a = 'V' if ($elements[$n] ne '');
2548                                $a = 'W' if ($elements[$n] =~ /\s$/);
2549                                $a = 'C' if ($elements[$n] =~ /$;$/);
2550                                $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2551                                $a = 'O' if ($elements[$n] eq '');
2552                                $a = 'E' if ($ca =~ /^\s*$/);
2553
2554                                my $op = $elements[$n + 1];
2555
2556                                my $c = '';
2557                                if (defined $elements[$n + 2]) {
2558                                        $c = 'V' if ($elements[$n + 2] ne '');
2559                                        $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2560                                        $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2561                                        $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2562                                        $c = 'O' if ($elements[$n + 2] eq '');
2563                                        $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2564                                } else {
2565                                        $c = 'E';
2566                                }
2567
2568                                my $ctx = "${a}x${c}";
2569
2570                                my $at = "(ctx:$ctx)";
2571
2572                                my $ptr = substr($blank, 0, $off) . "^";
2573                                my $hereptr = "$hereline$ptr\n";
2574
2575                                # Pull out the value of this operator.
2576                                my $op_type = substr($curr_values, $off + 1, 1);
2577
2578                                # Get the full operator variant.
2579                                my $opv = $op . substr($curr_vars, $off, 1);
2580
2581                                # Ignore operators passed as parameters.
2582                                if ($op_type ne 'V' &&
2583                                    $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2584
2585#                               # Ignore comments
2586#                               } elsif ($op =~ /^$;+$/) {
2587
2588                                # ; should have either the end of line or a space or \ after it
2589                                } elsif ($op eq ';') {
2590                                        if ($ctx !~ /.x[WEBC]/ &&
2591                                            $cc !~ /^\\/ && $cc !~ /^;/) {
2592                                                ERROR("SPACING",
2593                                                      "space required after that '$op' $at\n" . $hereptr);
2594                                        }
2595
2596                                # // is a comment
2597                                } elsif ($op eq '//') {
2598
2599                                # No spaces for:
2600                                #   ->
2601                                #   :   when part of a bitfield
2602                                } elsif ($op eq '->' || $opv eq ':B') {
2603                                        if ($ctx =~ /Wx.|.xW/) {
2604                                                ERROR("SPACING",
2605                                                      "spaces prohibited around that '$op' $at\n" . $hereptr);
2606                                        }
2607
2608                                # , must have a space on the right.
2609                                } elsif ($op eq ',') {
2610                                        if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
2611                                                ERROR("SPACING",
2612                                                      "space required after that '$op' $at\n" . $hereptr);
2613                                        }
2614
2615                                # '*' as part of a type definition -- reported already.
2616                                } elsif ($opv eq '*_') {
2617                                        #warn "'*' is part of type\n";
2618
2619                                # unary operators should have a space before and
2620                                # none after.  May be left adjacent to another
2621                                # unary operator, or a cast
2622                                } elsif ($op eq '!' || $op eq '~' ||
2623                                         $opv eq '*U' || $opv eq '-U' ||
2624                                         $opv eq '&U' || $opv eq '&&U') {
2625                                        if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2626                                                ERROR("SPACING",
2627                                                      "space required before that '$op' $at\n" . $hereptr);
2628                                        }
2629                                        if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2630                                                # A unary '*' may be const
2631
2632                                        } elsif ($ctx =~ /.xW/) {
2633                                                ERROR("SPACING",
2634                                                      "space prohibited after that '$op' $at\n" . $hereptr);
2635                                        }
2636
2637                                # unary ++ and unary -- are allowed no space on one side.
2638                                } elsif ($op eq '++' or $op eq '--') {
2639                                        if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2640                                                ERROR("SPACING",
2641                                                      "space required one side of that '$op' $at\n" . $hereptr);
2642                                        }
2643                                        if ($ctx =~ /Wx[BE]/ ||
2644                                            ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2645                                                ERROR("SPACING",
2646                                                      "space prohibited before that '$op' $at\n" . $hereptr);
2647                                        }
2648                                        if ($ctx =~ /ExW/) {
2649                                                ERROR("SPACING",
2650                                                      "space prohibited after that '$op' $at\n" . $hereptr);
2651                                        }
2652
2653
2654                                # << and >> may either have or not have spaces both sides
2655                                } elsif ($op eq '<<' or $op eq '>>' or
2656                                         $op eq '&' or $op eq '^' or $op eq '|' or
2657                                         $op eq '+' or $op eq '-' or
2658                                         $op eq '*' or $op eq '/' or
2659                                         $op eq '%')
2660                                {
2661                                        if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
2662                                                ERROR("SPACING",
2663                                                      "need consistent spacing around '$op' $at\n" .
2664                                                        $hereptr);
2665                                        }
2666
2667                                # A colon needs no spaces before when it is
2668                                # terminating a case value or a label.
2669                                } elsif ($opv eq ':C' || $opv eq ':L') {
2670                                        if ($ctx =~ /Wx./) {
2671                                                ERROR("SPACING",
2672                                                      "space prohibited before that '$op' $at\n" . $hereptr);
2673                                        }
2674
2675                                # All the others need spaces both sides.
2676                                } elsif ($ctx !~ /[EWC]x[CWE]/) {
2677                                        my $ok = 0;
2678
2679                                        # Ignore email addresses <foo@bar>
2680                                        if (($op eq '<' &&
2681                                             $cc =~ /^\S+\@\S+>/) ||
2682                                            ($op eq '>' &&
2683                                             $ca =~ /<\S+\@\S+$/))
2684                                        {
2685                                                $ok = 1;
2686                                        }
2687
2688                                        # Ignore ?:
2689                                        if (($opv eq ':O' && $ca =~ /\?$/) ||
2690                                            ($op eq '?' && $cc =~ /^:/)) {
2691                                                $ok = 1;
2692                                        }
2693
2694                                        if ($ok == 0) {
2695                                                ERROR("SPACING",
2696                                                      "spaces required around that '$op' $at\n" . $hereptr);
2697                                        }
2698                                }
2699                                $off += length($elements[$n + 1]);
2700                        }
2701                }
2702
2703# check for multiple assignments
2704                if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
2705                        CHK("MULTIPLE_ASSIGNMENTS",
2706                            "multiple assignments should be avoided\n" . $herecurr);
2707                }
2708
2709## # check for multiple declarations, allowing for a function declaration
2710## # continuation.
2711##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
2712##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
2713##
2714##                      # Remove any bracketed sections to ensure we do not
2715##                      # falsly report the parameters of functions.
2716##                      my $ln = $line;
2717##                      while ($ln =~ s/\([^\(\)]*\)//g) {
2718##                      }
2719##                      if ($ln =~ /,/) {
2720##                              WARN("MULTIPLE_DECLARATION",
2721##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
2722##                      }
2723##              }
2724
2725#need space before brace following if, while, etc
2726                if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
2727                    $line =~ /do{/) {
2728                        ERROR("SPACING",
2729                              "space required before the open brace '{'\n" . $herecurr);
2730                }
2731
2732# closing brace should have a space following it when it has anything
2733# on the line
2734                if ($line =~ /}(?!(?:,|;|\)))\S/) {
2735                        ERROR("SPACING",
2736                              "space required after that close brace '}'\n" . $herecurr);
2737                }
2738
2739# check spacing on square brackets
2740                if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2741                        ERROR("SPACING",
2742                              "space prohibited after that open square bracket '['\n" . $herecurr);
2743                }
2744                if ($line =~ /\s\]/) {
2745                        ERROR("SPACING",
2746                              "space prohibited before that close square bracket ']'\n" . $herecurr);
2747                }
2748
2749# check spacing on parentheses
2750                if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2751                    $line !~ /for\s*\(\s+;/) {
2752                        ERROR("SPACING",
2753                              "space prohibited after that open parenthesis '('\n" . $herecurr);
2754                }
2755                if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2756                    $line !~ /for\s*\(.*;\s+\)/ &&
2757                    $line !~ /:\s+\)/) {
2758                        ERROR("SPACING",
2759                              "space prohibited before that close parenthesis ')'\n" . $herecurr);
2760                }
2761
2762#goto labels aren't indented, allow a single space however
2763                if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
2764                   !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
2765                        WARN("INDENTED_LABEL",
2766                             "labels should not be indented\n" . $herecurr);
2767                }
2768
2769# Return is not a function.
2770                if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2771                        my $spacing = $1;
2772                        my $value = $2;
2773
2774                        # Flatten any parentheses
2775                        $value =~ s/\(/ \(/g;
2776                        $value =~ s/\)/\) /g;
2777                        while ($value =~ s/\[[^\[\]]*\]/1/ ||
2778                               $value !~ /(?:$Ident|-?$Constant)\s*
2779                                             $Compare\s*
2780                                             (?:$Ident|-?$Constant)/x &&
2781                               $value =~ s/\([^\(\)]*\)/1/) {
2782                        }
2783#print "value<$value>\n";
2784                        if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
2785                                ERROR("RETURN_PARENTHESES",
2786                                      "return is not a function, parentheses are not required\n" . $herecurr);
2787
2788                        } elsif ($spacing !~ /\s+/) {
2789                                ERROR("SPACING",
2790                                      "space required before the open parenthesis '('\n" . $herecurr);
2791                        }
2792                }
2793# Return of what appears to be an errno should normally be -'ve
2794                if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2795                        my $name = $1;
2796                        if ($name ne 'EOF' && $name ne 'ERROR') {
2797                                WARN("USE_NEGATIVE_ERRNO",
2798                                     "return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2799                        }
2800                }
2801
2802# Need a space before open parenthesis after if, while etc
2803                if ($line=~/\b(if|while|for|switch)\(/) {
2804                        ERROR("SPACING", "space required before the open parenthesis '('\n" . $herecurr);
2805                }
2806
2807# Check for illegal assignment in if conditional -- and check for trailing
2808# statements after the conditional.
2809                if ($line =~ /do\s*(?!{)/) {
2810                        ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2811                                ctx_statement_block($linenr, $realcnt, 0)
2812                                        if (!defined $stat);
2813                        my ($stat_next) = ctx_statement_block($line_nr_next,
2814                                                $remain_next, $off_next);
2815                        $stat_next =~ s/\n./\n /g;
2816                        ##print "stat<$stat> stat_next<$stat_next>\n";
2817
2818                        if ($stat_next =~ /^\s*while\b/) {
2819                                # If the statement carries leading newlines,
2820                                # then count those as offsets.
2821                                my ($whitespace) =
2822                                        ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2823                                my $offset =
2824                                        statement_rawlines($whitespace) - 1;
2825
2826                                $suppress_whiletrailers{$line_nr_next +
2827                                                                $offset} = 1;
2828                        }
2829                }
2830                if (!defined $suppress_whiletrailers{$linenr} &&
2831                    $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2832                        my ($s, $c) = ($stat, $cond);
2833
2834                        if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2835                                ERROR("ASSIGN_IN_IF",
2836                                      "do not use assignment in if condition\n" . $herecurr);
2837                        }
2838
2839                        # Find out what is on the end of the line after the
2840                        # conditional.
2841                        substr($s, 0, length($c), '');
2842                        $s =~ s/\n.*//g;
2843                        $s =~ s/$;//g;  # Remove any comments
2844                        if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2845                            $c !~ /}\s*while\s*/)
2846                        {
2847                                # Find out how long the conditional actually is.
2848                                my @newlines = ($c =~ /\n/gs);
2849                                my $cond_lines = 1 + $#newlines;
2850                                my $stat_real = '';
2851
2852                                $stat_real = raw_line($linenr, $cond_lines)
2853                                                        . "\n" if ($cond_lines);
2854                                if (defined($stat_real) && $cond_lines > 1) {
2855                                        $stat_real = "[...]\n$stat_real";
2856                                }
2857
2858                                ERROR("TRAILING_STATEMENTS",
2859                                      "trailing statements should be on next line\n" . $herecurr . $stat_real);
2860                        }
2861                }
2862
2863# Check for bitwise tests written as boolean
2864                if ($line =~ /
2865                        (?:
2866                                (?:\[|\(|\&\&|\|\|)
2867                                \s*0[xX][0-9]+\s*
2868                                (?:\&\&|\|\|)
2869                        |
2870                                (?:\&\&|\|\|)
2871                                \s*0[xX][0-9]+\s*
2872                                (?:\&\&|\|\||\)|\])
2873                        )/x)
2874                {
2875                        WARN("HEXADECIMAL_BOOLEAN_TEST",
2876                             "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2877                }
2878
2879# if and else should not have general statements after it
2880                if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2881                        my $s = $1;
2882                        $s =~ s/$;//g;  # Remove any comments
2883                        if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2884                                ERROR("TRAILING_STATEMENTS",
2885                                      "trailing statements should be on next line\n" . $herecurr);
2886                        }
2887                }
2888# if should not continue a brace
2889                if ($line =~ /}\s*if\b/) {
2890                        ERROR("TRAILING_STATEMENTS",
2891                              "trailing statements should be on next line\n" .
2892                                $herecurr);
2893                }
2894# case and default should not have general statements after them
2895                if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2896                    $line !~ /\G(?:
2897                        (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2898                        \s*return\s+
2899                    )/xg)
2900                {
2901                        ERROR("TRAILING_STATEMENTS",
2902                              "trailing statements should be on next line\n" . $herecurr);
2903                }
2904
2905                # Check for }<nl>else {, these must be at the same
2906                # indent level to be relevant to each other.
2907                if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2908                                                $previndent == $indent) {
2909                        ERROR("ELSE_AFTER_BRACE",
2910                              "else should follow close brace '}'\n" . $hereprev);
2911                }
2912
2913                if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2914                                                $previndent == $indent) {
2915                        my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2916
2917                        # Find out what is on the end of the line after the
2918                        # conditional.
2919                        substr($s, 0, length($c), '');
2920                        $s =~ s/\n.*//g;
2921
2922                        if ($s =~ /^\s*;/) {
2923                                ERROR("WHILE_AFTER_BRACE",
2924                                      "while should follow close brace '}'\n" . $hereprev);
2925                        }
2926                }
2927
2928#CamelCase
2929                while ($line =~ m{($Constant|$Lval)}g) {
2930                        my $var = $1;
2931                        if ($var !~ /$Constant/ &&
2932                            $var =~ /[A-Z]\w*[a-z]|[a-z]\w*[A-Z]/ &&
2933                            $var !~ /"^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
2934                            !defined $camelcase{$var}) {
2935                                $camelcase{$var} = 1;
2936                                WARN("CAMELCASE",
2937                                     "Avoid CamelCase: <$var>\n" . $herecurr);
2938                        }
2939                }
2940
2941#no spaces allowed after \ in define
2942                if ($line=~/\#\s*define.*\\\s$/) {
2943                        WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
2944                             "Whitepspace after \\ makes next lines useless\n" . $herecurr);
2945                }
2946
2947#warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
2948                if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
2949                        my $file = "$1.h";
2950                        my $checkfile = "include/linux/$file";
2951                        if (-f "$root/$checkfile" &&
2952                            $realfile ne $checkfile &&
2953                            $1 !~ /$allowed_asm_includes/)
2954                        {
2955                                if ($realfile =~ m{^arch/}) {
2956                                        CHK("ARCH_INCLUDE_LINUX",
2957                                            "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2958                                } else {
2959                                        WARN("INCLUDE_LINUX",
2960                                             "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2961                                }
2962                        }
2963                }
2964
2965# multi-statement macros should be enclosed in a do while loop, grab the
2966# first statement and ensure its the whole macro if its not enclosed
2967# in a known good container
2968                if ($realfile !~ m@/vmlinux.lds.h$@ &&
2969                    $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2970                        my $ln = $linenr;
2971                        my $cnt = $realcnt;
2972                        my ($off, $dstat, $dcond, $rest);
2973                        my $ctx = '';
2974                        ($dstat, $dcond, $ln, $cnt, $off) =
2975                                ctx_statement_block($linenr, $realcnt, 0);
2976                        $ctx = $dstat;
2977                        #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2978                        #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2979
2980                        $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
2981                        $dstat =~ s/$;//g;
2982                        $dstat =~ s/\\\n.//g;
2983                        $dstat =~ s/^\s*//s;
2984                        $dstat =~ s/\s*$//s;
2985
2986                        # Flatten any parentheses and braces
2987                        while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2988                               $dstat =~ s/\{[^\{\}]*\}/1/ ||
2989                               $dstat =~ s/\[[^\[\]]*\]/1/)
2990                        {
2991                        }
2992
2993                        # Flatten any obvious string concatentation.
2994                        while ($dstat =~ s/("X*")\s*$Ident/$1/ ||
2995                               $dstat =~ s/$Ident\s*("X*")/$1/)
2996                        {
2997                        }
2998
2999                        my $exceptions = qr{
3000                                $Declare|
3001                                module_param_named|
3002                                MODULE_PARM_DESC|
3003                                DECLARE_PER_CPU|
3004                                DEFINE_PER_CPU|
3005                                __typeof__\(|
3006                                union|
3007                                struct|
3008                                \.$Ident\s*=\s*|
3009                                ^\"|\"$
3010                        }x;
3011                        #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
3012                        if ($dstat ne '' &&
3013                            $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                    # 10, // foo(),
3014                            $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                    # foo();
3015                            $dstat !~ /^[!~-]?(?:$Ident|$Constant)$/ &&         # 10 // foo() // !foo // ~foo // -foo
3016                            $dstat !~ /^'X'$/ &&                                        # character constants
3017                            $dstat !~ /$exceptions/ &&
3018                            $dstat !~ /^\.$Ident\s*=/ &&                                # .foo =
3019                            $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ &&          # stringification #foo
3020                            $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&       # do {...} while (...); // do {...} while (...)
3021                            $dstat !~ /^for\s*$Constant$/ &&                            # for (...)
3022                            $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&   # for (...) bar()
3023                            $dstat !~ /^do\s*{/ &&                                      # do {...
3024                            $dstat !~ /^\({/)                                           # ({...
3025                        {
3026                                $ctx =~ s/\n*$//;
3027                                my $herectx = $here . "\n";
3028                                my $cnt = statement_rawlines($ctx);
3029
3030                                for (my $n = 0; $n < $cnt; $n++) {
3031                                        $herectx .= raw_line($linenr, $n) . "\n";
3032                                }
3033
3034                                if ($dstat =~ /;/) {
3035                                        ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
3036                                              "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
3037                                } else {
3038                                        ERROR("COMPLEX_MACRO",
3039                                              "Macros with complex values should be enclosed in parenthesis\n" . "$herectx");
3040                                }
3041                        }
3042
3043# check for line continuations outside of #defines, preprocessor #, and asm
3044
3045                } else {
3046                        if ($prevline !~ /^..*\\$/ &&
3047                            $line !~ /^\+\s*\#.*\\$/ &&         # preprocessor
3048                            $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ &&   # asm
3049                            $line =~ /^\+.*\\$/) {
3050                                WARN("LINE_CONTINUATIONS",
3051                                     "Avoid unnecessary line continuations\n" . $herecurr);
3052                        }
3053                }
3054
3055# do {} while (0) macro tests:
3056# single-statement macros do not need to be enclosed in do while (0) loop,
3057# macro should not end with a semicolon
3058                if ($^V && $^V ge 5.10.0 &&
3059                    $realfile !~ m@/vmlinux.lds.h$@ &&
3060                    $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
3061                        my $ln = $linenr;
3062                        my $cnt = $realcnt;
3063                        my ($off, $dstat, $dcond, $rest);
3064                        my $ctx = '';
3065                        ($dstat, $dcond, $ln, $cnt, $off) =
3066                                ctx_statement_block($linenr, $realcnt, 0);
3067                        $ctx = $dstat;
3068
3069                        $dstat =~ s/\\\n.//g;
3070
3071                        if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
3072                                my $stmts = $2;
3073                                my $semis = $3;
3074
3075                                $ctx =~ s/\n*$//;
3076                                my $cnt = statement_rawlines($ctx);
3077                                my $herectx = $here . "\n";
3078
3079                                for (my $n = 0; $n < $cnt; $n++) {
3080                                        $herectx .= raw_line($linenr, $n) . "\n";
3081                                }
3082
3083                                if (($stmts =~ tr/;/;/) == 1 &&
3084                                    $stmts !~ /^\s*(if|while|for|switch)\b/) {
3085                                        WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
3086                                             "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
3087                                }
3088                                if (defined $semis && $semis ne "") {
3089                                        WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
3090                                             "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
3091                                }
3092                        }
3093                }
3094
3095# make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
3096# all assignments may have only one of the following with an assignment:
3097#       .
3098#       ALIGN(...)
3099#       VMLINUX_SYMBOL(...)
3100                if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
3101                        WARN("MISSING_VMLINUX_SYMBOL",
3102                             "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
3103                }
3104
3105# check for redundant bracing round if etc
3106                if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
3107                        my ($level, $endln, @chunks) =
3108                                ctx_statement_full($linenr, $realcnt, 1);
3109                        #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
3110                        #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
3111                        if ($#chunks > 0 && $level == 0) {
3112                                my @allowed = ();
3113                                my $allow = 0;
3114                                my $seen = 0;
3115                                my $herectx = $here . "\n";
3116                                my $ln = $linenr - 1;
3117                                for my $chunk (@chunks) {
3118                                        my ($cond, $block) = @{$chunk};
3119
3120                                        # If the condition carries leading newlines, then count those as offsets.
3121                                        my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
3122                                        my $offset = statement_rawlines($whitespace) - 1;
3123
3124                                        $allowed[$allow] = 0;
3125                                        #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
3126
3127                                        # We have looked at and allowed this specific line.
3128                                        $suppress_ifbraces{$ln + $offset} = 1;
3129
3130                                        $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
3131                                        $ln += statement_rawlines($block) - 1;
3132
3133                                        substr($block, 0, length($cond), '');
3134
3135                                        $seen++ if ($block =~ /^\s*{/);
3136
3137                                        #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
3138                                        if (statement_lines($cond) > 1) {
3139                                                #print "APW: ALLOWED: cond<$cond>\n";
3140                                                $allowed[$allow] = 1;
3141                                        }
3142                                        if ($block =~/\b(?:if|for|while)\b/) {
3143                                                #print "APW: ALLOWED: block<$block>\n";
3144                                                $allowed[$allow] = 1;
3145                                        }
3146                                        if (statement_block_size($block) > 1) {
3147                                                #print "APW: ALLOWED: lines block<$block>\n";
3148                                                $allowed[$allow] = 1;
3149                                        }
3150                                        $allow++;
3151                                }
3152                                if ($seen) {
3153                                        my $sum_allowed = 0;
3154                                        foreach (@allowed) {
3155                                                $sum_allowed += $_;
3156                                        }
3157                                        if ($sum_allowed == 0) {
3158                                                WARN("BRACES",
3159                                                     "braces {} are not necessary for any arm of this statement\n" . $herectx);
3160                                        } elsif ($sum_allowed != $allow &&
3161                                                 $seen != $allow) {
3162                                                CHK("BRACES",
3163                                                    "braces {} should be used on all arms of this statement\n" . $herectx);
3164                                        }
3165                                }
3166                        }
3167                }
3168                if (!defined $suppress_ifbraces{$linenr - 1} &&
3169                                        $line =~ /\b(if|while|for|else)\b/) {
3170                        my $allowed = 0;
3171
3172                        # Check the pre-context.
3173                        if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
3174                                #print "APW: ALLOWED: pre<$1>\n";
3175                                $allowed = 1;
3176                        }
3177
3178                        my ($level, $endln, @chunks) =
3179                                ctx_statement_full($linenr, $realcnt, $-[0]);
3180
3181                        # Check the condition.
3182                        my ($cond, $block) = @{$chunks[0]};
3183                        #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
3184                        if (defined $cond) {
3185                                substr($block, 0, length($cond), '');
3186                        }
3187                        if (statement_lines($cond) > 1) {
3188                                #print "APW: ALLOWED: cond<$cond>\n";
3189                                $allowed = 1;
3190                        }
3191                        if ($block =~/\b(?:if|for|while)\b/) {
3192                                #print "APW: ALLOWED: block<$block>\n";
3193                                $allowed = 1;
3194                        }
3195                        if (statement_block_size($block) > 1) {
3196                                #print "APW: ALLOWED: lines block<$block>\n";
3197                                $allowed = 1;
3198                        }
3199                        # Check the post-context.
3200                        if (defined $chunks[1]) {
3201                                my ($cond, $block) = @{$chunks[1]};
3202                                if (defined $cond) {
3203                                        substr($block, 0, length($cond), '');
3204                                }
3205                                if ($block =~ /^\s*\{/) {
3206                                        #print "APW: ALLOWED: chunk-1 block<$block>\n";
3207                                        $allowed = 1;
3208                                }
3209                        }
3210                        if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
3211                                my $herectx = $here . "\n";
3212                                my $cnt = statement_rawlines($block);
3213
3214                                for (my $n = 0; $n < $cnt; $n++) {
3215                                        $herectx .= raw_line($linenr, $n) . "\n";
3216                                }
3217
3218                                WARN("BRACES",
3219                                     "braces {} are not necessary for single statement blocks\n" . $herectx);
3220                        }
3221                }
3222
3223# check for unnecessary blank lines around braces
3224                if (($line =~ /^..*}\s*$/ && $prevline =~ /^.\s*$/)) {
3225                        CHK("BRACES",
3226                            "Blank lines aren't necessary before a close brace '}'\n" . $hereprev);
3227                }
3228                if (($line =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
3229                        CHK("BRACES",
3230                            "Blank lines aren't necessary after an open brace '{'\n" . $hereprev);
3231                }
3232
3233# no volatiles please
3234                my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
3235                if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
3236                        WARN("VOLATILE",
3237                             "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
3238                }
3239
3240# warn about #if 0
3241                if ($line =~ /^.\s*\#\s*if\s+0\b/) {
3242                        CHK("REDUNDANT_CODE",
3243                            "if this code is redundant consider removing it\n" .
3244                                $herecurr);
3245                }
3246
3247# check for needless "if (<foo>) fn(<foo>)" uses
3248                if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
3249                        my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
3250                        if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
3251                                WARN('NEEDLESS_IF',
3252                                     "$1(NULL) is safe this check is probably not required\n" . $hereprev);
3253                        }
3254                }
3255
3256# prefer usleep_range over udelay
3257                if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
3258                        # ignore udelay's < 10, however
3259                        if (! ($1 < 10) ) {
3260                                CHK("USLEEP_RANGE",
3261                                    "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
3262                        }
3263                }
3264
3265# warn about unexpectedly long msleep's
3266                if ($line =~ /\bmsleep\s*\((\d+)\);/) {
3267                        if ($1 < 20) {
3268                                WARN("MSLEEP",
3269                                     "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
3270                        }
3271                }
3272
3273# warn about #ifdefs in C files
3274#               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
3275#                       print "#ifdef in C files should be avoided\n";
3276#                       print "$herecurr";
3277#                       $clean = 0;
3278#               }
3279
3280# warn about spacing in #ifdefs
3281                if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
3282                        ERROR("SPACING",
3283                              "exactly one space required after that #$1\n" . $herecurr);
3284                }
3285
3286# check for spinlock_t definitions without a comment.
3287                if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
3288                    $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
3289                        my $which = $1;
3290                        if (!ctx_has_comment($first_line, $linenr)) {
3291                                CHK("UNCOMMENTED_DEFINITION",
3292                                    "$1 definition without comment\n" . $herecurr);
3293                        }
3294                }
3295# check for memory barriers without a comment.
3296                if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
3297                        if (!ctx_has_comment($first_line, $linenr)) {
3298                                CHK("MEMORY_BARRIER",
3299                                    "memory barrier without comment\n" . $herecurr);
3300                        }
3301                }
3302# check of hardware specific defines
3303                if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
3304                        CHK("ARCH_DEFINES",
3305                            "architecture specific defines should be avoided\n" .  $herecurr);
3306                }
3307
3308# Check that the storage class is at the beginning of a declaration
3309                if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
3310                        WARN("STORAGE_CLASS",
3311                             "storage class should be at the beginning of the declaration\n" . $herecurr)
3312                }
3313
3314# check the location of the inline attribute, that it is between
3315# storage class and type.
3316                if ($line =~ /\b$Type\s+$Inline\b/ ||
3317                    $line =~ /\b$Inline\s+$Storage\b/) {
3318                        ERROR("INLINE_LOCATION",
3319                              "inline keyword should sit between storage class and type\n" . $herecurr);
3320                }
3321
3322# Check for __inline__ and __inline, prefer inline
3323                if ($line =~ /\b(__inline__|__inline)\b/) {
3324                        WARN("INLINE",
3325                             "plain inline is preferred over $1\n" . $herecurr);
3326                }
3327
3328# Check for __attribute__ packed, prefer __packed
3329                if ($line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
3330                        WARN("PREFER_PACKED",
3331                             "__packed is preferred over __attribute__((packed))\n" . $herecurr);
3332                }
3333
3334# Check for __attribute__ aligned, prefer __aligned
3335                if ($line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
3336                        WARN("PREFER_ALIGNED",
3337                             "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
3338                }
3339
3340# Check for __attribute__ format(printf, prefer __printf
3341                if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
3342                        WARN("PREFER_PRINTF",
3343                             "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr);
3344                }
3345
3346# Check for __attribute__ format(scanf, prefer __scanf
3347                if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
3348                        WARN("PREFER_SCANF",
3349                             "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr);
3350                }
3351
3352# check for sizeof(&)
3353                if ($line =~ /\bsizeof\s*\(\s*\&/) {
3354                        WARN("SIZEOF_ADDRESS",
3355                             "sizeof(& should be avoided\n" . $herecurr);
3356                }
3357
3358# check for sizeof without parenthesis
3359                if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
3360                        WARN("SIZEOF_PARENTHESIS",
3361                             "sizeof $1 should be sizeof($1)\n" . $herecurr);
3362                }
3363
3364# check for line continuations in quoted strings with odd counts of "
3365                if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
3366                        WARN("LINE_CONTINUATIONS",
3367                             "Avoid line continuations in quoted strings\n" . $herecurr);
3368                }
3369
3370# check for struct spinlock declarations
3371                if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
3372                        WARN("USE_SPINLOCK_T",
3373                             "struct spinlock should be spinlock_t\n" . $herecurr);
3374                }
3375
3376# Check for misused memsets
3377                if ($^V && $^V ge 5.10.0 &&
3378                    defined $stat &&
3379                    $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) {
3380
3381                        my $ms_addr = $2;
3382                        my $ms_val = $7;
3383                        my $ms_size = $12;
3384
3385                        if ($ms_size =~ /^(0x|)0$/i) {
3386                                ERROR("MEMSET",
3387                                      "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
3388                        } elsif ($ms_size =~ /^(0x|)1$/i) {
3389                                WARN("MEMSET",
3390                                     "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
3391                        }
3392                }
3393
3394# typecasts on min/max could be min_t/max_t
3395                if ($^V && $^V ge 5.10.0 &&
3396                    defined $stat &&
3397                    $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
3398                        if (defined $2 || defined $7) {
3399                                my $call = $1;
3400                                my $cast1 = deparenthesize($2);
3401                                my $arg1 = $3;
3402                                my $cast2 = deparenthesize($7);
3403                                my $arg2 = $8;
3404                                my $cast;
3405
3406                                if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
3407                                        $cast = "$cast1 or $cast2";
3408                                } elsif ($cast1 ne "") {
3409                                        $cast = $cast1;
3410                                } else {
3411                                        $cast = $cast2;
3412                                }
3413                                WARN("MINMAX",
3414                                     "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
3415                        }
3416                }
3417
3418# check usleep_range arguments
3419                if ($^V && $^V ge 5.10.0 &&
3420                    defined $stat &&
3421                    $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
3422                        my $min = $1;
3423                        my $max = $7;
3424                        if ($min eq $max) {
3425                                WARN("USLEEP_RANGE",
3426                                     "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
3427                        } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
3428                                 $min > $max) {
3429                                WARN("USLEEP_RANGE",
3430                                     "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
3431                        }
3432                }
3433
3434# check for new externs in .c files.
3435                if ($realfile =~ /\.c$/ && defined $stat &&
3436                    $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
3437                {
3438                        my $function_name = $1;
3439                        my $paren_space = $2;
3440
3441                        my $s = $stat;
3442                        if (defined $cond) {
3443                                substr($s, 0, length($cond), '');
3444                        }
3445                        if ($s =~ /^\s*;/ &&
3446                            $function_name ne 'uninitialized_var')
3447                        {
3448                                WARN("AVOID_EXTERNS",
3449                                     "externs should be avoided in .c files\n" .  $herecurr);
3450                        }
3451
3452                        if ($paren_space =~ /\n/) {
3453                                WARN("FUNCTION_ARGUMENTS",
3454                                     "arguments for function declarations should follow identifier\n" . $herecurr);
3455                        }
3456
3457                } elsif ($realfile =~ /\.c$/ && defined $stat &&
3458                    $stat =~ /^.\s*extern\s+/)
3459                {
3460                        WARN("AVOID_EXTERNS",
3461                             "externs should be avoided in .c files\n" .  $herecurr);
3462                }
3463
3464# checks for new __setup's
3465                if ($rawline =~ /\b__setup\("([^"]*)"/) {
3466                        my $name = $1;
3467
3468                        if (!grep(/$name/, @setup_docs)) {
3469                                CHK("UNDOCUMENTED_SETUP",
3470                                    "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
3471                        }
3472                }
3473
3474# check for pointless casting of kmalloc return
3475                if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
3476                        WARN("UNNECESSARY_CASTS",
3477                             "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
3478                }
3479
3480# check for alloc argument mismatch
3481                if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
3482                        WARN("ALLOC_ARRAY_ARGS",
3483                             "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
3484                }
3485
3486# check for multiple semicolons
3487                if ($line =~ /;\s*;\s*$/) {
3488                        WARN("ONE_SEMICOLON",
3489                             "Statements terminations use 1 semicolon\n" . $herecurr);
3490                }
3491
3492# check for switch/default statements without a break;
3493                if ($^V && $^V ge 5.10.0 &&
3494                    defined $stat &&
3495                    $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
3496                        my $ctx = '';
3497                        my $herectx = $here . "\n";
3498                        my $cnt = statement_rawlines($stat);
3499                        for (my $n = 0; $n < $cnt; $n++) {
3500                                $herectx .= raw_line($linenr, $n) . "\n";
3501                        }
3502                        WARN("DEFAULT_NO_BREAK",
3503                             "switch default: should use break\n" . $herectx);
3504                }
3505
3506# check for gcc specific __FUNCTION__
3507                if ($line =~ /__FUNCTION__/) {
3508                        WARN("USE_FUNC",
3509                             "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
3510                }
3511
3512# check for use of yield()
3513                if ($line =~ /\byield\s*\(\s*\)/) {
3514                        WARN("YIELD",
3515                             "Using yield() is generally wrong. See yield() kernel-doc (sched/core.c)\n"  . $herecurr);
3516                }
3517
3518# check for semaphores initialized locked
3519                if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
3520                        WARN("CONSIDER_COMPLETION",
3521                             "consider using a completion\n" . $herecurr);
3522                }
3523
3524# recommend kstrto* over simple_strto* and strict_strto*
3525                if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
3526                        WARN("CONSIDER_KSTRTO",
3527                             "$1 is obsolete, use k$3 instead\n" . $herecurr);
3528                }
3529
3530# check for __initcall(), use device_initcall() explicitly please
3531                if ($line =~ /^.\s*__initcall\s*\(/) {
3532                        WARN("USE_DEVICE_INITCALL",
3533                             "please use device_initcall() instead of __initcall()\n" . $herecurr);
3534                }
3535
3536# check for various ops structs, ensure they are const.
3537                my $struct_ops = qr{acpi_dock_ops|
3538                                address_space_operations|
3539                                backlight_ops|
3540                                block_device_operations|
3541                                dentry_operations|
3542                                dev_pm_ops|
3543                                dma_map_ops|
3544                                extent_io_ops|
3545                                file_lock_operations|
3546                                file_operations|
3547                                hv_ops|
3548                                ide_dma_ops|
3549                                intel_dvo_dev_ops|
3550                                item_operations|
3551                                iwl_ops|
3552                                kgdb_arch|
3553                                kgdb_io|
3554                                kset_uevent_ops|
3555                                lock_manager_operations|
3556                                microcode_ops|
3557                                mtrr_ops|
3558                                neigh_ops|
3559                                nlmsvc_binding|
3560                                pci_raw_ops|
3561                                pipe_buf_operations|
3562                                platform_hibernation_ops|
3563                                platform_suspend_ops|
3564                                proto_ops|
3565                                rpc_pipe_ops|
3566                                seq_operations|
3567                                snd_ac97_build_ops|
3568                                soc_pcmcia_socket_ops|
3569                                stacktrace_ops|
3570                                sysfs_ops|
3571                                tty_operations|
3572                                usb_mon_operations|
3573                                wd_ops}x;
3574                if ($line !~ /\bconst\b/ &&
3575                    $line =~ /\bstruct\s+($struct_ops)\b/) {
3576                        WARN("CONST_STRUCT",
3577                             "struct $1 should normally be const\n" .
3578                                $herecurr);
3579                }
3580
3581# use of NR_CPUS is usually wrong
3582# ignore definitions of NR_CPUS and usage to define arrays as likely right
3583                if ($line =~ /\bNR_CPUS\b/ &&
3584                    $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
3585                    $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
3586                    $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
3587                    $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
3588                    $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
3589                {
3590                        WARN("NR_CPUS",
3591                             "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
3592                }
3593
3594# check for %L{u,d,i} in strings
3595                my $string;
3596                while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
3597                        $string = substr($rawline, $-[1], $+[1] - $-[1]);
3598                        $string =~ s/%%/__/g;
3599                        if ($string =~ /(?<!%)%L[udi]/) {
3600                                WARN("PRINTF_L",
3601                                     "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
3602                                last;
3603                        }
3604                }
3605
3606# whine mightly about in_atomic
3607                if ($line =~ /\bin_atomic\s*\(/) {
3608                        if ($realfile =~ m@^drivers/@) {
3609                                ERROR("IN_ATOMIC",
3610                                      "do not use in_atomic in drivers\n" . $herecurr);
3611                        } elsif ($realfile !~ m@^kernel/@) {
3612                                WARN("IN_ATOMIC",
3613                                     "use of in_atomic() is incorrect outside core kernel code\n" . $herecurr);
3614                        }
3615                }
3616
3617# check for lockdep_set_novalidate_class
3618                if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
3619                    $line =~ /__lockdep_no_validate__\s*\)/ ) {
3620                        if ($realfile !~ m@^kernel/lockdep@ &&
3621                            $realfile !~ m@^include/linux/lockdep@ &&
3622                            $realfile !~ m@^drivers/base/core@) {
3623                                ERROR("LOCKDEP",
3624                                      "lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
3625                        }
3626                }
3627
3628                if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
3629                    $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
3630                        WARN("EXPORTED_WORLD_WRITABLE",
3631                             "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
3632                }
3633        }
3634
3635        # If we have no input at all, then there is nothing to report on
3636        # so just keep quiet.
3637        if ($#rawlines == -1) {
3638                exit(0);
3639        }
3640
3641        # In mailback mode only produce a report in the negative, for
3642        # things that appear to be patches.
3643        if ($mailback && ($clean == 1 || !$is_patch)) {
3644                exit(0);
3645        }
3646
3647        # This is not a patch, and we are are in 'no-patch' mode so
3648        # just keep quiet.
3649        if (!$chk_patch && !$is_patch) {
3650                exit(0);
3651        }
3652
3653        if (!$is_patch) {
3654                ERROR("NOT_UNIFIED_DIFF",
3655                      "Does not appear to be a unified-diff format patch\n");
3656        }
3657        if ($is_patch && $chk_signoff && $signoff == 0) {
3658                ERROR("MISSING_SIGN_OFF",
3659                      "Missing Signed-off-by: line(s)\n");
3660        }
3661
3662        print report_dump();
3663        if ($summary && !($clean == 1 && $quiet == 1)) {
3664                print "$filename " if ($summary_file);
3665                print "total: $cnt_error errors, $cnt_warn warnings, " .
3666                        (($check)? "$cnt_chk checks, " : "") .
3667                        "$cnt_lines lines checked\n";
3668                print "\n" if ($quiet == 0);
3669        }
3670
3671        if ($quiet == 0) {
3672
3673                if ($^V lt 5.10.0) {
3674                        print("NOTE: perl $^V is not modern enough to detect all possible issues.\n");
3675                        print("An upgrade to at least perl v5.10.0 is suggested.\n\n");
3676                }
3677
3678                # If there were whitespace errors which cleanpatch can fix
3679                # then suggest that.
3680                if ($rpt_cleaners) {
3681                        print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
3682                        print "      scripts/cleanfile\n\n";
3683                        $rpt_cleaners = 0;
3684                }
3685        }
3686
3687        if ($quiet == 0 && keys %ignore_type) {
3688            print "NOTE: Ignored message types:";
3689            foreach my $ignore (sort keys %ignore_type) {
3690                print " $ignore";
3691            }
3692            print "\n\n";
3693        }
3694
3695        if ($clean == 1 && $quiet == 0) {
3696                print "$vname has no obvious style problems and is ready for submission.\n"
3697        }
3698        if ($clean == 0 && $quiet == 0) {
3699                print << "EOM";
3700$vname has style problems, please review.
3701
3702If any of these errors are false positives, please report
3703them to the maintainer, see CHECKPATCH in MAINTAINERS.
3704EOM
3705        }
3706
3707        return $clean;
3708}
3709
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