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         local *FH;
  32         $filename = $file;
  33         open(FH, "<$filename") or die "$filename: $!\n";
  34         $lineno = 0;
  35         while ($line = <FH>) {
  36                 $lineno++;
  37                 &check_include();
  38                 &check_asm_types();
  39                 &check_sizetypes();
  40                 &check_declarations();
  41                 # Dropped for now. Too much noise &check_config();
  42         }
  43         close FH;
  44 }
  45 exit $ret;
  46
  47 sub check_include
  48 {
  49         if ($line =~ m/^\s*#\s*include\s+<((asm|linux).*)>/) {
  50                 my $inc = $1;
  51                 my $found;
  52                 $found = stat($dir . "/" . $inc);
  53                 if (!$found) {
  54                         $inc =~ s#asm/#asm-$arch/#;
  55                         $found = stat($dir . "/" . $inc);
  56                 }
  57                 if (!$found) {
  58                         printf STDERR "$filename:$lineno: included file '$inc' is not exported\n";
  59                         $ret = 1;
  60                 }
  61         }
  62 }
  63
  64 sub check_declarations
  65 {
  66         if ($line =~m/^\s*extern\b/) {
  67                 printf STDERR "$filename:$lineno: " .
  68                               "userspace cannot call function or variable " .
  69                               "defined in the kernel\n";
  70         }
  71 }
  72
  73 sub check_config
  74 {
  75         if ($line =~ m/[^a-zA-Z0-9_]+CONFIG_([a-zA-Z0-9_]+)[^a-zA-Z0-9_]/) {
  76                 printf STDERR "$filename:$lineno: leaks CONFIG_$1 to userspace where it is not valid\n";
  77         }
  78 }
  79
  80 my $linux_asm_types;
  81 sub check_asm_types()
  82 {
  83         if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) {
  84                 return;
  85         }
  86         if ($lineno == 1) {
  87                 $linux_asm_types = 0;
  88         } elsif ($linux_asm_types >= 1) {
  89                 return;
  90         }
  91         if ($line =~ m/^\s*#\s*include\s+<asm\/types.h>/) {
  92                 $linux_asm_types = 1;
  93                 printf STDERR "$filename:$lineno: " .
  94                 "include of <linux/types.h> is preferred over <asm/types.h>\n"
  95                 # Warn until headers are all fixed
  96                 #$ret = 1;
  97         }
  98 }
  99
 100 my $linux_types;
 101 sub check_sizetypes
 102 {
 103         if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) {
 104                 return;
 105         }
 106         if ($lineno == 1) {
 107                 $linux_types = 0;
 108         } elsif ($linux_types >= 1) {
 109                 return;
 110         }
 111         if ($line =~ m/^\s*#\s*include\s+<linux\/types.h>/) {
 112                 $linux_types = 1;
 113                 return;
 114         }
 115         if ($line =~ m/__[us](8|16|32|64)\b/) {
 116                 printf STDERR "$filename:$lineno: " .
 117                               "found __[us]{8,16,32,64} type " .
 118                               "without #include <linux/types.h>\n";
 119                 $linux_types = 2;
 120                 # Warn until headers are all fixed
 121                 #$ret = 1;
 122         }
 123 }
 124