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67b7ebe091
'extern' checking information is not clear, refine it. Plus, fix a comment. Signed-off-by: WANG Cong <amwang@redhat.com> [sam: redid the extern error message] Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
124 lines
2.7 KiB
Perl
124 lines
2.7 KiB
Perl
#!/usr/bin/perl -w
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#
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# headers_check.pl execute a number of trivial consistency checks
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#
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# Usage: headers_check.pl dir arch [files...]
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# dir: dir to look for included files
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# arch: architecture
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# files: list of files to check
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#
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# The script reads the supplied files line by line and:
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#
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# 1) for each include statement it checks if the
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# included file actually exists.
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# Only include files located in asm* and linux* are checked.
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# The rest are assumed to be system include files.
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#
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# 2) It is checked that prototypes does not use "extern"
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#
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# 3) Check for leaked CONFIG_ symbols
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use strict;
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my ($dir, $arch, @files) = @ARGV;
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my $ret = 0;
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my $line;
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my $lineno = 0;
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my $filename;
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foreach my $file (@files) {
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local *FH;
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$filename = $file;
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open(FH, "<$filename") or die "$filename: $!\n";
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$lineno = 0;
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while ($line = <FH>) {
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$lineno++;
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&check_include();
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&check_asm_types();
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&check_sizetypes();
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&check_declarations();
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# Dropped for now. Too much noise &check_config();
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}
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close FH;
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}
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exit $ret;
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sub check_include
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{
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if ($line =~ m/^\s*#\s*include\s+<((asm|linux).*)>/) {
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my $inc = $1;
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my $found;
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$found = stat($dir . "/" . $inc);
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if (!$found) {
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$inc =~ s#asm/#asm-$arch/#;
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$found = stat($dir . "/" . $inc);
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}
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if (!$found) {
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printf STDERR "$filename:$lineno: included file '$inc' is not exported\n";
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$ret = 1;
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}
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}
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}
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sub check_declarations
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{
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if ($line =~m/^\s*extern\b/) {
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printf STDERR "$filename:$lineno: " .
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"userspace cannot call function or variable " .
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"defined in the kernel\n";
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}
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}
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sub check_config
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{
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if ($line =~ m/[^a-zA-Z0-9_]+CONFIG_([a-zA-Z0-9_]+)[^a-zA-Z0-9_]/) {
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printf STDERR "$filename:$lineno: leaks CONFIG_$1 to userspace where it is not valid\n";
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}
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}
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my $linux_asm_types;
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sub check_asm_types()
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{
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if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) {
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return;
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}
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if ($lineno == 1) {
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$linux_asm_types = 0;
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} elsif ($linux_asm_types >= 1) {
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return;
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}
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if ($line =~ m/^\s*#\s*include\s+<asm\/types.h>/) {
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$linux_asm_types = 1;
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printf STDERR "$filename:$lineno: " .
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"include of <linux/types.h> is preferred over <asm/types.h>\n"
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# Warn until headers are all fixed
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#$ret = 1;
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}
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}
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my $linux_types;
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sub check_sizetypes
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{
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if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) {
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return;
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}
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if ($lineno == 1) {
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$linux_types = 0;
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} elsif ($linux_types >= 1) {
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return;
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}
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if ($line =~ m/^\s*#\s*include\s+<linux\/types.h>/) {
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$linux_types = 1;
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return;
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}
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if ($line =~ m/__[us](8|16|32|64)\b/) {
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printf STDERR "$filename:$lineno: " .
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"found __[us]{8,16,32,64} type " .
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"without #include <linux/types.h>\n";
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$linux_types = 2;
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# Warn until headers are all fixed
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#$ret = 1;
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}
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}
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