linux/scripts/kconfig/streamline_config.pl
<<
>>
Prefs
   1#!/usr/bin/perl -w
   2#
   3# Copyright 2005-2009 - Steven Rostedt
   4# Licensed under the terms of the GNU GPL License version 2
   5#
   6#  It's simple enough to figure out how this works.
   7#  If not, then you can ask me at stripconfig@goodmis.org
   8#
   9# What it does?
  10#
  11#   If you have installed a Linux kernel from a distribution
  12#   that turns on way too many modules than you need, and
  13#   you only want the modules you use, then this program
  14#   is perfect for you.
  15#
  16#   It gives you the ability to turn off all the modules that are
  17#   not loaded on your system.
  18#
  19# Howto:
  20#
  21#  1. Boot up the kernel that you want to stream line the config on.
  22#  2. Change directory to the directory holding the source of the
  23#       kernel that you just booted.
  24#  3. Copy the configuraton file to this directory as .config
  25#  4. Have all your devices that you need modules for connected and
  26#      operational (make sure that their corresponding modules are loaded)
  27#  5. Run this script redirecting the output to some other file
  28#       like config_strip.
  29#  6. Back up your old config (if you want too).
  30#  7. copy the config_strip file to .config
  31#  8. Run "make oldconfig"
  32#
  33#  Now your kernel is ready to be built with only the modules that
  34#  are loaded.
  35#
  36# Here's what I did with my Debian distribution.
  37#
  38#    cd /usr/src/linux-2.6.10
  39#    cp /boot/config-2.6.10-1-686-smp .config
  40#    ~/bin/streamline_config > config_strip
  41#    mv .config config_sav
  42#    mv config_strip .config
  43#    make oldconfig
  44#
  45use strict;
  46use Getopt::Long;
  47
  48# set the environment variable LOCALMODCONFIG_DEBUG to get
  49# debug output.
  50my $debugprint = 0;
  51$debugprint = 1 if (defined($ENV{LOCALMODCONFIG_DEBUG}));
  52
  53sub dprint {
  54    return if (!$debugprint);
  55    print STDERR @_;
  56}
  57
  58my $config = ".config";
  59
  60my $uname = `uname -r`;
  61chomp $uname;
  62
  63my @searchconfigs = (
  64        {
  65            "file" => ".config",
  66            "exec" => "cat",
  67        },
  68        {
  69            "file" => "/proc/config.gz",
  70            "exec" => "zcat",
  71        },
  72        {
  73            "file" => "/boot/config-$uname",
  74            "exec" => "cat",
  75        },
  76        {
  77            "file" => "/boot/vmlinuz-$uname",
  78            "exec" => "scripts/extract-ikconfig",
  79            "test" => "scripts/extract-ikconfig",
  80        },
  81        {
  82            "file" => "vmlinux",
  83            "exec" => "scripts/extract-ikconfig",
  84            "test" => "scripts/extract-ikconfig",
  85        },
  86        {
  87            "file" => "/lib/modules/$uname/kernel/kernel/configs.ko",
  88            "exec" => "scripts/extract-ikconfig",
  89            "test" => "scripts/extract-ikconfig",
  90        },
  91        {
  92            "file" => "kernel/configs.ko",
  93            "exec" => "scripts/extract-ikconfig",
  94            "test" => "scripts/extract-ikconfig",
  95        },
  96        {
  97            "file" => "kernel/configs.o",
  98            "exec" => "scripts/extract-ikconfig",
  99            "test" => "scripts/extract-ikconfig",
 100        },
 101);
 102
 103sub read_config {
 104    foreach my $conf (@searchconfigs) {
 105        my $file = $conf->{"file"};
 106
 107        next if ( ! -f "$file");
 108
 109        if (defined($conf->{"test"})) {
 110            `$conf->{"test"} $conf->{"file"} 2>/dev/null`;
 111            next if ($?);
 112        }
 113
 114        my $exec = $conf->{"exec"};
 115
 116        print STDERR "using config: '$file'\n";
 117
 118        open(my $infile, '-|', "$exec $file") || die "Failed to run $exec $file";
 119        my @x = <$infile>;
 120        close $infile;
 121        return @x;
 122    }
 123    die "No config file found";
 124}
 125
 126my @config_file = read_config;
 127
 128# Parse options
 129my $localmodconfig = 0;
 130my $localyesconfig = 0;
 131
 132GetOptions("localmodconfig" => \$localmodconfig,
 133           "localyesconfig" => \$localyesconfig);
 134
 135# Get the build source and top level Kconfig file (passed in)
 136my $ksource = ($ARGV[0] ? $ARGV[0] : '.');
 137my $kconfig = $ARGV[1];
 138my $lsmod_file = $ENV{'LSMOD'};
 139
 140my @makefiles = `find $ksource -name Makefile 2>/dev/null`;
 141chomp @makefiles;
 142
 143my %depends;
 144my %selects;
 145my %prompts;
 146my %objects;
 147my $var;
 148my $iflevel = 0;
 149my @ifdeps;
 150
 151# prevent recursion
 152my %read_kconfigs;
 153
 154sub read_kconfig {
 155    my ($kconfig) = @_;
 156
 157    my $state = "NONE";
 158    my $config;
 159    my @kconfigs;
 160
 161    my $cont = 0;
 162    my $line;
 163
 164    my $source = "$ksource/$kconfig";
 165    my $last_source = "";
 166
 167    # Check for any environment variables used
 168    while ($source =~ /\$(\w+)/ && $last_source ne $source) {
 169        my $env = $1;
 170        $last_source = $source;
 171        $source =~ s/\$$env/$ENV{$env}/;
 172    }
 173
 174    open(my $kinfile, '<', $source) || die "Can't open $kconfig";
 175    while (<$kinfile>) {
 176        chomp;
 177
 178        # Make sure that lines ending with \ continue
 179        if ($cont) {
 180            $_ = $line . " " . $_;
 181        }
 182
 183        if (s/\\$//) {
 184            $cont = 1;
 185            $line = $_;
 186            next;
 187        }
 188
 189        $cont = 0;
 190
 191        # collect any Kconfig sources
 192        if (/^source\s*"(.*)"/) {
 193            $kconfigs[$#kconfigs+1] = $1;
 194        }
 195
 196        # configs found
 197        if (/^\s*(menu)?config\s+(\S+)\s*$/) {
 198            $state = "NEW";
 199            $config = $2;
 200
 201            # Add depends for 'if' nesting
 202            for (my $i = 0; $i < $iflevel; $i++) {
 203                if ($i) {
 204                    $depends{$config} .= " " . $ifdeps[$i];
 205                } else {
 206                    $depends{$config} = $ifdeps[$i];
 207                }
 208                $state = "DEP";
 209            }
 210
 211        # collect the depends for the config
 212        } elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) {
 213            $state = "DEP";
 214            $depends{$config} = $1;
 215        } elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) {
 216            $depends{$config} .= " " . $1;
 217
 218        # Get the configs that select this config
 219        } elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
 220            my $conf = $1;
 221            if (defined($selects{$conf})) {
 222                $selects{$conf} .= " " . $config;
 223            } else {
 224                $selects{$conf} = $config;
 225            }
 226
 227        # configs without prompts must be selected
 228        } elsif ($state ne "NONE" && /^\s*tristate\s\S/) {
 229            # note if the config has a prompt
 230            $prompts{$config} = 1;
 231
 232        # Check for if statements
 233        } elsif (/^if\s+(.*\S)\s*$/) {
 234            my $deps = $1;
 235            # remove beginning and ending non text
 236            $deps =~ s/^[^a-zA-Z0-9_]*//;
 237            $deps =~ s/[^a-zA-Z0-9_]*$//;
 238
 239            my @deps = split /[^a-zA-Z0-9_]+/, $deps;
 240
 241            $ifdeps[$iflevel++] = join ':', @deps;
 242
 243        } elsif (/^endif/) {
 244
 245            $iflevel-- if ($iflevel);
 246
 247        # stop on "help"
 248        } elsif (/^\s*help\s*$/) {
 249            $state = "NONE";
 250        }
 251    }
 252    close($kinfile);
 253
 254    # read in any configs that were found.
 255    foreach my $kconfig (@kconfigs) {
 256        if (!defined($read_kconfigs{$kconfig})) {
 257            $read_kconfigs{$kconfig} = 1;
 258            read_kconfig($kconfig);
 259        }
 260    }
 261}
 262
 263if ($kconfig) {
 264    read_kconfig($kconfig);
 265}
 266
 267# Makefiles can use variables to define their dependencies
 268sub convert_vars {
 269    my ($line, %vars) = @_;
 270
 271    my $process = "";
 272
 273    while ($line =~ s/^(.*?)(\$\((.*?)\))//) {
 274        my $start = $1;
 275        my $variable = $2;
 276        my $var = $3;
 277
 278        if (defined($vars{$var})) {
 279            $process .= $start . $vars{$var};
 280        } else {
 281            $process .= $start . $variable;
 282        }
 283    }
 284
 285    $process .= $line;
 286
 287    return $process;
 288}
 289
 290# Read all Makefiles to map the configs to the objects
 291foreach my $makefile (@makefiles) {
 292
 293    my $line = "";
 294    my %make_vars;
 295
 296    open(my $infile, '<', $makefile) || die "Can't open $makefile";
 297    while (<$infile>) {
 298        # if this line ends with a backslash, continue
 299        chomp;
 300        if (/^(.*)\\$/) {
 301            $line .= $1;
 302            next;
 303        }
 304
 305        $line .= $_;
 306        $_ = $line;
 307        $line = "";
 308
 309        my $objs;
 310
 311        # Convert variables in a line (could define configs)
 312        $_ = convert_vars($_, %make_vars);
 313
 314        # collect objects after obj-$(CONFIG_FOO_BAR)
 315        if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) {
 316            $var = $1;
 317            $objs = $2;
 318
 319        # check if variables are set
 320        } elsif (/^\s*(\S+)\s*[:]?=\s*(.*\S)/) {
 321            $make_vars{$1} = $2;
 322        }
 323        if (defined($objs)) {
 324            foreach my $obj (split /\s+/,$objs) {
 325                $obj =~ s/-/_/g;
 326                if ($obj =~ /(.*)\.o$/) {
 327                    # Objects may be enabled by more than one config.
 328                    # Store configs in an array.
 329                    my @arr;
 330
 331                    if (defined($objects{$1})) {
 332                        @arr = @{$objects{$1}};
 333                    }
 334
 335                    $arr[$#arr+1] = $var;
 336
 337                    # The objects have a hash mapping to a reference
 338                    # of an array of configs.
 339                    $objects{$1} = \@arr;
 340                }
 341            }
 342        }
 343    }
 344    close($infile);
 345}
 346
 347my %modules;
 348my $linfile;
 349
 350if (defined($lsmod_file)) {
 351    if ( ! -f $lsmod_file) {
 352        if ( -f $ENV{'objtree'}."/".$lsmod_file) {
 353            $lsmod_file = $ENV{'objtree'}."/".$lsmod_file;
 354        } else {
 355                die "$lsmod_file not found";
 356        }
 357    }
 358
 359    my $otype = ( -x $lsmod_file) ? '-|' : '<';
 360    open($linfile, $otype, $lsmod_file);
 361
 362} else {
 363
 364    # see what modules are loaded on this system
 365    my $lsmod;
 366
 367    foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) {
 368        if ( -x "$dir/lsmod" ) {
 369            $lsmod = "$dir/lsmod";
 370            last;
 371        }
 372}
 373    if (!defined($lsmod)) {
 374        # try just the path
 375        $lsmod = "lsmod";
 376    }
 377
 378    open($linfile, '-|', $lsmod) || die "Can not call lsmod with $lsmod";
 379}
 380
 381while (<$linfile>) {
 382        next if (/^Module/);  # Skip the first line.
 383        if (/^(\S+)/) {
 384                $modules{$1} = 1;
 385        }
 386}
 387close ($linfile);
 388
 389# add to the configs hash all configs that are needed to enable
 390# a loaded module. This is a direct obj-${CONFIG_FOO} += bar.o
 391# where we know we need bar.o so we add FOO to the list.
 392my %configs;
 393foreach my $module (keys(%modules)) {
 394    if (defined($objects{$module})) {
 395        my @arr = @{$objects{$module}};
 396        foreach my $conf (@arr) {
 397            $configs{$conf} = $module;
 398            dprint "$conf added by direct ($module)\n";
 399        }
 400    } else {
 401        # Most likely, someone has a custom (binary?) module loaded.
 402        print STDERR "$module config not found!!\n";
 403    }
 404}
 405
 406# Read the current config, and see what is enabled. We want to
 407# ignore configs that we would not enable anyway.
 408
 409my %orig_configs;
 410my $valid = "A-Za-z_0-9";
 411
 412foreach my $line (@config_file) {
 413    $_ = $line;
 414
 415    if (/(CONFIG_[$valid]*)=(m|y)/) {
 416        $orig_configs{$1} = $2;
 417    }
 418}
 419
 420my $repeat = 1;
 421
 422my $depconfig;
 423
 424#
 425# Note, we do not care about operands (like: &&, ||, !) we want to add any
 426# config that is in the depend list of another config. This script does
 427# not enable configs that are not already enabled. If we come across a
 428# config A that depends on !B, we can still add B to the list of depends
 429# to keep on. If A was on in the original config, B would not have been
 430# and B would not be turned on by this script.
 431#
 432sub parse_config_depends
 433{
 434    my ($p) = @_;
 435
 436    while ($p =~ /[$valid]/) {
 437
 438        if ($p =~ /^[^$valid]*([$valid]+)/) {
 439            my $conf = "CONFIG_" . $1;
 440
 441            $p =~ s/^[^$valid]*[$valid]+//;
 442
 443            # We only need to process if the depend config is a module
 444            if (!defined($orig_configs{$conf}) || !$orig_configs{conf} eq "m") {
 445                next;
 446            }
 447
 448            if (!defined($configs{$conf})) {
 449                # We must make sure that this config has its
 450                # dependencies met.
 451                $repeat = 1; # do again
 452                dprint "$conf selected by depend $depconfig\n";
 453                $configs{$conf} = 1;
 454            }
 455        } else {
 456            die "this should never happen";
 457        }
 458    }
 459}
 460
 461# Select is treated a bit differently than depends. We call this
 462# when a config has no prompt and requires another config to be
 463# selected. We use to just select all configs that selected this
 464# config, but found that that can balloon into enabling hundreds
 465# of configs that we do not care about.
 466#
 467# The idea is we look at all the configs that select it. If one
 468# is already in our list of configs to enable, then there's nothing
 469# else to do. If there isn't, we pick the first config that was
 470# enabled in the orignal config and use that.
 471sub parse_config_selects
 472{
 473    my ($config, $p) = @_;
 474
 475    my $next_config;
 476
 477    while ($p =~ /[$valid]/) {
 478
 479        if ($p =~ /^[^$valid]*([$valid]+)/) {
 480            my $conf = "CONFIG_" . $1;
 481
 482            $p =~ s/^[^$valid]*[$valid]+//;
 483
 484            # Make sure that this config exists in the current .config file
 485            if (!defined($orig_configs{$conf})) {
 486                dprint "$conf not set for $config select\n";
 487                next;
 488            }
 489
 490            # Check if something other than a module selects this config
 491            if (defined($orig_configs{$conf}) && $orig_configs{$conf} ne "m") {
 492                dprint "$conf (non module) selects config, we are good\n";
 493                # we are good with this
 494                return;
 495            }
 496            if (defined($configs{$conf})) {
 497                dprint "$conf selects $config so we are good\n";
 498                # A set config selects this config, we are good
 499                return;
 500            }
 501            # Set this config to be selected
 502            if (!defined($next_config)) {
 503                $next_config = $conf;
 504            }
 505        } else {
 506            die "this should never happen";
 507        }
 508    }
 509
 510    # If no possible config selected this, then something happened.
 511    if (!defined($next_config)) {
 512        print STDERR "WARNING: $config is required, but nothing in the\n";
 513        print STDERR "  current config selects it.\n";
 514        return;
 515    }
 516
 517    # If we are here, then we found no config that is set and
 518    # selects this config. Repeat.
 519    $repeat = 1;
 520    # Make this config need to be selected
 521    $configs{$next_config} = 1;
 522    dprint "$next_config selected by select $config\n";
 523}
 524
 525my %process_selects;
 526
 527# loop through all configs, select their dependencies.
 528sub loop_depend {
 529    $repeat = 1;
 530
 531    while ($repeat) {
 532        $repeat = 0;
 533
 534      forloop:
 535        foreach my $config (keys %configs) {
 536
 537            # If this config is not a module, we do not need to process it
 538            if (defined($orig_configs{$config}) && $orig_configs{$config} ne "m") {
 539                next forloop;
 540            }
 541
 542            $config =~ s/^CONFIG_//;
 543            $depconfig = $config;
 544
 545            if (defined($depends{$config})) {
 546                # This config has dependencies. Make sure they are also included
 547                parse_config_depends $depends{$config};
 548            }
 549
 550            # If the config has no prompt, then we need to check if a config
 551            # that is enabled selected it. Or if we need to enable one.
 552            if (!defined($prompts{$config}) && defined($selects{$config})) {
 553                $process_selects{$config} = 1;
 554            }
 555        }
 556    }
 557}
 558
 559sub loop_select {
 560
 561    foreach my $config (keys %process_selects) {
 562        $config =~ s/^CONFIG_//;
 563
 564        dprint "Process select $config\n";
 565
 566        # config has no prompt and must be selected.
 567        parse_config_selects $config, $selects{$config};
 568    }
 569}
 570
 571while ($repeat) {
 572    # Get the first set of configs and their dependencies.
 573    loop_depend;
 574
 575    $repeat = 0;
 576
 577    # Now we need to see if we have to check selects;
 578    loop_select;
 579}           
 580
 581my %setconfigs;
 582
 583# Finally, read the .config file and turn off any module enabled that
 584# we could not find a reason to keep enabled.
 585foreach my $line (@config_file) {
 586    $_ = $line;
 587
 588    if (/CONFIG_IKCONFIG/) {
 589        if (/# CONFIG_IKCONFIG is not set/) {
 590            # enable IKCONFIG at least as a module
 591            print "CONFIG_IKCONFIG=m\n";
 592            # don't ask about PROC
 593            print "# CONFIG_IKCONFIG_PROC is not set\n";
 594        } else {
 595            print;
 596        }
 597        next;
 598    }
 599
 600    if (/^(CONFIG.*)=(m|y)/) {
 601        if (defined($configs{$1})) {
 602            if ($localyesconfig) {
 603                $setconfigs{$1} = 'y';
 604                print "$1=y\n";
 605                next;
 606            } else {
 607                $setconfigs{$1} = $2;
 608            }
 609        } elsif ($2 eq "m") {
 610            print "# $1 is not set\n";
 611            next;
 612        }
 613    }
 614    print;
 615}
 616
 617# Integrity check, make sure all modules that we want enabled do
 618# indeed have their configs set.
 619loop:
 620foreach my $module (keys(%modules)) {
 621    if (defined($objects{$module})) {
 622        my @arr = @{$objects{$module}};
 623        foreach my $conf (@arr) {
 624            if (defined($setconfigs{$conf})) {
 625                next loop;
 626            }
 627        }
 628        print STDERR "module $module did not have configs";
 629        foreach my $conf (@arr) {
 630            print STDERR " " , $conf;
 631        }
 632        print STDERR "\n";
 633    }
 634}
 635
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.