scripts/checkversion.pl

   1 #! /usr/bin/env perl
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # checkversion finds uses of all macros in <linux/version.h>
   5 # where the source files do not #include <linux/version.h>; or cases
   6 # of including <linux/version.h> where it is not needed.
   7 # Copyright (C) 2003, Randy Dunlap <rdunlap@infradead.org>
   8
   9 use strict;
  10
  11 $| = 1;
  12
  13 my $debugging;
  14
  15 foreach my $file (@ARGV) {
  16     next if $file =~ "include/generated/uapi/linux/version\.h";
  17     next if $file =~ "usr/include/linux/version\.h";
  18     # Open this file.
  19     open( my $f, '<', $file )
  20       or die "Can't open $file: $!\n";
  21
  22     # Initialize variables.
  23     my ($fInComment, $fInString, $fUseVersion);
  24     my $iLinuxVersion = 0;
  25
  26     while (<$f>) {
  27         # Strip comments.
  28         $fInComment && (s+^.*?\*/+ +o ? ($fInComment = 0) : next);
  29         m+/\*+o && (s+/\*.*?\*/+ +go, (s+/\*.*$+ +o && ($fInComment = 1)));
  30
  31         # Pick up definitions.
  32         if ( m/^\s*#/o ) {
  33             $iLinuxVersion      = $. if m/^\s*#\s*include\s*"linux\/version\.h"/o;
  34         }
  35
  36         # Strip strings.
  37         $fInString && (s+^.*?"+ +o ? ($fInString = 0) : next);
  38         m+"+o && (s+".*?"+ +go, (s+".*$+ +o && ($fInString = 1)));
  39
  40         # Pick up definitions.
  41         if ( m/^\s*#/o ) {
  42             $iLinuxVersion      = $. if m/^\s*#\s*include\s*<linux\/version\.h>/o;
  43         }
  44
  45         # Look for uses: LINUX_VERSION_CODE, KERNEL_VERSION,
  46         # LINUX_VERSION_MAJOR, LINUX_VERSION_PATCHLEVEL, LINUX_VERSION_SUBLEVEL
  47         if (($_ =~ /LINUX_VERSION_CODE/) || ($_ =~ /\WKERNEL_VERSION/) ||
  48             ($_ =~ /LINUX_VERSION_MAJOR/) || ($_ =~ /LINUX_VERSION_PATCHLEVEL/) ||
  49             ($_ =~ /LINUX_VERSION_SUBLEVEL/)) {
  50             $fUseVersion = 1;
  51             last if $iLinuxVersion;
  52         }
  53     }
  54
  55     # Report used version IDs without include?
  56     if ($fUseVersion && ! $iLinuxVersion) {
  57         print "$file: $.: need linux/version.h\n";
  58     }
  59
  60     # Report superfluous includes.
  61     if ($iLinuxVersion && ! $fUseVersion) {
  62         print "$file: $iLinuxVersion linux/version.h not needed.\n";
  63     }
  64
  65     # debug: report OK results:
  66     if ($debugging) {
  67         if ($iLinuxVersion && $fUseVersion) {
  68             print "$file: version use is OK ($iLinuxVersion)\n";
  69         }
  70         if (! $iLinuxVersion && ! $fUseVersion) {
  71             print "$file: version use is OK (none)\n";
  72         }
  73     }
  74
  75     close($f);
  76 }