projects/linux·blob v2.6.37 · refs

125 lines · 2.7 KiB

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\b/) {
68 printf STDERR "$filename:$lineno: " .
69 "userspace cannot call function or variable " .
70 "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