mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
a7e1d98f3e
"make headers_check" warns about soundcard.h for (at least) five years
now:
[...]/usr/include/linux/soundcard.h:1054: userspace cannot reference function or variable defined in the kernel
We're apparently stuck with providing OSSlib-3.8 compatibility, so let's
special case this declaration just to silence it.
Notes:
0) Support for OSSlib post 3.8 was already removed in commit 43a990765a
("sound: Remove OSSlib stuff from linux/soundcard.h"). Five years have
passed since that commit: do people still care about OSSlib-3.8? If
not, quite a bit of code could be remove from soundcard.h (and probably
ultrasound.h).
2) By the way, what is actually meant by:
It is no longer possible to actually link against OSSlib with this
header, but we still provide these macros for programs using them.
Doesn't that mean compatibility to OSSlib isn't even useful?
3) Anyhow, a previous discussion soundcard.h, which led to that commit,
starts at https://lkml.org/lkml/2009/1/20/349 .
4) And, yes, I sneaked in a whitespace fix.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Cc: Takashi Iwai <tiwai@suse.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
165 lines
3.6 KiB
Perl
165 lines
3.6 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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use File::Basename;
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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 $file (@files) {
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$filename = $file;
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open(my $fh, '<', $filename)
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or die "$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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# soundcard.h is what it is
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if ($line =~ m/^void seqbuf_dump\(void\);/) {
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return;
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}
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if ($line =~ m/^(\s*extern|unsigned|char|short|int|long|void)\b/) {
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printf STDERR "$filename:$lineno: " .
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"userspace cannot reference function or " .
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"variable defined in the kernel\n";
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}
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}
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sub check_config
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{
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if ($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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my %import_stack = ();
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sub check_include_typesh
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{
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my $path = $_[0];
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my $import_path;
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my $fh;
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my @file_paths = ($path, $dir . "/" . $path, dirname($filename) . "/" . $path);
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for my $possible ( @file_paths ) {
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if (not $import_stack{$possible} and open($fh, '<', $possible)) {
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$import_path = $possible;
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$import_stack{$import_path} = 1;
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last;
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}
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}
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if (eof $fh) {
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return;
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}
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my $line;
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while ($line = <$fh>) {
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if ($line =~ m/^\s*#\s*include\s+<linux\/types.h>/) {
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$linux_types = 1;
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last;
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}
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if (my $included = ($line =~ /^\s*#\s*include\s+[<"](\S+)[>"]/)[0]) {
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check_include_typesh($included);
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}
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}
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close $fh;
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delete $import_stack{$import_path};
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}
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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 (my $included = ($line =~ /^\s*#\s*include\s+[<"](\S+)[>"]/)[0]) {
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check_include_typesh($included);
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}
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if ($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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