linux/scripts/headers_check.pl
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   1#!/usr/bin/perl -w
   2#
   3# headers_check.pl execute a number of trivial consistency checks
   4#
   5# Usage: headers_check.pl dir arch [files...]
   6# dir:   dir to look for included files
   7# arch:  architecture
   8# files: list of files to check
   9#
  10# The script reads the supplied files line by line and:
  11#
  12# 1) for each include statement it checks if the
  13#    included file actually exists.
  14#    Only include files located in asm* and linux* are checked.
  15#    The rest are assumed to be system include files.
  16#
  17# 2) It is checked that prototypes does not use "extern"
  18#
  19# 3) Check for leaked CONFIG_ symbols
  20
  21use strict;
  22
  23my ($dir, $arch, @files) = @ARGV;
  24
  25my $ret = 0;
  26my $line;
  27my $lineno = 0;
  28my $filename;
  29
  30foreach my $file (@files) {
  31        $filename = $file;
  32
  33        open(my $fh, '<', $filename)
  34                or die "$filename: $!\n";
  35        $lineno = 0;
  36        while ($line = <$fh>) {
  37                $lineno++;
  38                &check_include();
  39                &check_asm_types();
  40                &check_sizetypes();
  41                &check_declarations();
  42                # Dropped for now. Too much noise &check_config();
  43        }
  44        close $fh;
  45}
  46exit $ret;
  47
  48sub check_include
  49{
  50        if ($line =~ m/^\s*#\s*include\s+<((asm|linux).*)>/) {
  51                my $inc = $1;
  52                my $found;
  53                $found = stat($dir . "/" . $inc);
  54                if (!$found) {
  55                        $inc =~ s#asm/#asm-$arch/#;
  56                        $found = stat($dir . "/" . $inc);
  57                }
  58                if (!$found) {
  59                        printf STDERR "$filename:$lineno: included file '$inc' is not exported\n";
  60                        $ret = 1;
  61                }
  62        }
  63}
  64
  65sub check_declarations
  66{
  67        if ($line =~m/^(\s*extern|unsigned|char|short|int|long|void)\b/) {
  68                printf STDERR "$filename:$lineno: " .
  69                              "userspace cannot reference function or " .
  70                              "variable defined in the kernel\n";
  71        }
  72}
  73
  74sub check_config
  75{
  76        if ($line =~ m/[^a-zA-Z0-9_]+CONFIG_([a-zA-Z0-9_]+)[^a-zA-Z0-9_]/) {
  77                printf STDERR "$filename:$lineno: leaks CONFIG_$1 to userspace where it is not valid\n";
  78        }
  79}
  80
  81my $linux_asm_types;
  82sub check_asm_types
  83{
  84        if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) {
  85                return;
  86        }
  87        if ($lineno == 1) {
  88                $linux_asm_types = 0;
  89        } elsif ($linux_asm_types >= 1) {
  90                return;
  91        }
  92        if ($line =~ m/^\s*#\s*include\s+<asm\/types.h>/) {
  93                $linux_asm_types = 1;
  94                printf STDERR "$filename:$lineno: " .
  95                "include of <linux/types.h> is preferred over <asm/types.h>\n"
  96                # Warn until headers are all fixed
  97                #$ret = 1;
  98        }
  99}
 100
 101my $linux_types;
 102sub check_sizetypes
 103{
 104        if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) {
 105                return;
 106        }
 107        if ($lineno == 1) {
 108                $linux_types = 0;
 109        } elsif ($linux_types >= 1) {
 110                return;
 111        }
 112        if ($line =~ m/^\s*#\s*include\s+<linux\/types.h>/) {
 113                $linux_types = 1;
 114                return;
 115        }
 116        if ($line =~ m/__[us](8|16|32|64)\b/) {
 117                printf STDERR "$filename:$lineno: " .
 118                              "found __[us]{8,16,32,64} type " .
 119                              "without #include <linux/types.h>\n";
 120                $linux_types = 2;
 121                # Warn until headers are all fixed
 122                #$ret = 1;
 123        }
 124}
 125
 126
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