scripts/headers_check.pl

   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
  21 use strict;
  22
  23 my ($dir, $arch, @files) = @ARGV;
  24
  25 my $ret = 0;
  26 my $line;
  27 my $lineno = 0;
  28 my $filename;
  29
  30 foreach 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 }
  46 exit $ret;
  47
  48 sub check_include
  49 {
  50         if ($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                         $ret = 1;
  61                 }
  62         }
  63 }
  64
  65 sub check_declarations
  66 {
  67         if ($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
  74 sub 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
  81 my $linux_asm_types;
  82 sub check_asm_types
  83 {
  84         if ($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
 101 my $linux_types;
 102 sub check_sizetypes
 103 {
 104         if ($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