linux-kernel - Re: [PATCH] checkpatch: Add test for printf formats with 0x that emit decimal

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Date:	Sun, 03 Aug 2014 20:03:55 -0700
From:	Hans Wennborg <hans@...shq.net>
To:	Joe Perches <joe@...ches.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH] checkpatch: Add test for printf formats with 0x that
 emit decimal

On 08/03/2014 07:50 PM, Joe Perches wrote:
> 0x%<foo> should be used to emit hexadecimal values.
>
> Uses of 0x%[udi] emit decimal values but these should
> probably instead use 0x%x variants.
>
> Warn on these uses.

Good idea!

>
> Signed-off-by: Joe Perches <joe@...ches.com>
> Noticed-by: Hans Wennborg <hans@...shq.net>
> ---
>   scripts/checkpatch.pl | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index da74e65..0178fe0 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -4985,6 +4985,10 @@ sub process {
>   		while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
>   			$string = substr($rawline, $-[1], $+[1] - $-[1]);
>   			$string =~ s/%%/__/g;
> +			if ($string =~ /(0x(?<!%)%[0-9.\*]*[Ll]*[udi])(?![xX])/) {

Maybe the regex should have a \b to check for a word boundary before the 
0 to avoid matching things like "800x%d"? (I don't know if that occurs 
in the kernel, but I've seen it elsewhere.)

  - Hans
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