Re: [PATCH V2] checkpatch: don't ask for asm/file.h to linux/file.h unconditionally

[Joe Perches <joe@perches.com>]

On Tue, 2015-03-31 at 21:06 +0200, Fabian Frederick wrote:
> 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)
[]
> diff --git 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 $asminclude = `grep -Ec "#include\\s+<asm/$file>" $root/$checkfile`;

I think it'd be better to move this into the if below so
that the grep is done only when $root/$checkfile exists.

>  			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",