Re: [PATCH V3 linux-next] checkpatch: don't ask for asm/file.h to linux/file.h unconditionally

[Joe Perches <joe@perches.com>]

On Tue, 2015-03-31 at 21:56 +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)

OK by me.

I would have done it directly in the if,
but no real worries either way.

Andrew Morton is the common path to get checkpatch
patches upstream, so I cc'd him on this reply.

If he doesn't pick it up within a couple/few weeks,
send it again.

cheers, Joe

> Signed-off-by: Fabian Frederick <fabf@skynet.be>
> ---
> V3:
> 	Only grep when $root/$checkfile exists (suggested by Joe Perches)
> V2:
> 	Apply suggestions by Joe Perches:
> 	-Remove superfluous -i in grep
> 	-Use $root to make checkpatch callable from anywhere
> 	-Process all include cases.
> 
>  scripts/checkpatch.pl | 18 +++++++++++-------
>  1 file changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index d54a814..c72e7ee 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -4242,7 +4242,8 @@ sub process {
>  			}
>  		}
>  
> -#warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
> +# warn if <asm/foo.h> is #included and <linux/foo.h> is available and includes
> +# itself <asm/foo.h> (uses RAW line)
>  		if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
>  			my $file = "$1.h";
>  			my $checkfile = "include/linux/$file";
> @@ -4250,12 +4251,15 @@ sub process {
>  			    $realfile ne $checkfile &&
>  			    $1 !~ /$allowed_asm_includes/)
>  			{
> -				if ($realfile =~ m{^arch/}) {
> -					CHK("ARCH_INCLUDE_LINUX",
> -					    "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
> -				} else {
> -					WARN("INCLUDE_LINUX",
> -					     "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
> +				my $asminclude = `grep -Ec "#include\\s+<asm/$file>" $root/$checkfile`;
> +				if ($asminclude > 0) {
> +					if ($realfile =~ m{^arch/}) {
> +						CHK("ARCH_INCLUDE_LINUX",
> +						    "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
> +					} else {
> +						WARN("INCLUDE_LINUX",
> +						     "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
> +					}
>  				}
>  			}
>  		}