linux-kernel - Re: [PATCH] scripts: checkpatch.pl: Fix existing typedef false positive warning

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Date:	Sun, 21 Sep 2014 19:31:30 -0700
From:	Joe Perches <joe@...ches.com>
To:	Greg Donald <gdonald@...il.com>
Cc:	Andy Whitcroft <apw@...onical.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts: checkpatch.pl: Fix existing typedef false
 positive warning

On Sun, 2014-09-21 at 20:32 -0500, Greg Donald wrote:
> Fixing an "open brace '{' following struct go on the same line" error causes a
> false positive warning "do not add new typedefs". Fix existing typedef false
> positive warning.

This doesn't work.
The matching deleted line can be any number of lines above.

> Signed-off-by: Greg Donald <gdonald@...il.com>
> ---
>  scripts/checkpatch.pl | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 4d08b39..eafe5e7 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -3081,14 +3081,24 @@ sub process {
>  		}
>  
>  # check for new typedefs, only function parameters and sparse annotations
> -# make sense.
> +# and existing typedefs make sense.
>  		if ($line =~ /\btypedef\s/ &&
>  		    $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
>  		    $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
>  		    $line !~ /\b$typeTypedefs\b/ &&
>  		    $line !~ /\b__bitwise(?:__|)\b/) {
> -			WARN("NEW_TYPEDEFS",
> -			     "do not add new typedefs\n" . $herecurr);
> +			# check if $line is diff-like
> +			if (substr($rawlines[$linenr - 3], 0, 1) eq '-') {
> +				my $oldline3 = substr($rawlines[$linenr - 3], 1);
> +				# check if typedef already existed
> +				if ($line !~ /$oldline3/) {
> +					WARN("NEW_TYPEDEFS",
> +					     "do not add new typedefs\n" . $herecurr);
> +				}
> +			} else {
> +				WARN("NEW_TYPEDEFS",
> +				     "do not add new typedefs\n" . $herecurr);
> +			}
>  		}
>  
>  # * goes on variable not on type



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