[RFC 1/1 linux-next] checkpatch: don't ask for asm/file.h to linux/file.h unconditionally

[Fabian Frederick <fabf@skynet.be>]

Currently checkpatch warns when asm/file.h is included and linux/file.h
exists. That conversion can be made when linux/file.h includes asm/file.h
which is not always the case.(See signal.h)

Signed-off-by: Fabian Frederick <fabf@skynet.be>
---
 scripts/checkpatch.pl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d54a814..5824829 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4242,13 +4242,16 @@ sub process {
 			}
 		}
 
-#warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
+# warn if <asm/foo.h> is #included and <linux/foo.h> is available and includes
+# itself <asm/foo.h> (uses RAW line)
 		if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
 			my $file = "$1.h";
 			my $checkfile = "include/linux/$file";
+			my $asminclude = `grep -ci "#include <asm/$file.h>" $checkfile`;
 			if (-f "$root/$checkfile" &&
 			    $realfile ne $checkfile &&
-			    $1 !~ /$allowed_asm_includes/)
+			    $1 !~ /$allowed_asm_includes/ &&
+			    $asminclude > 0 )
 			{
 				if ($realfile =~ m{^arch/}) {
 					CHK("ARCH_INCLUDE_LINUX",
-- 
1.9.1