linux-kernel - Re: [PATCH 06/29] checkpatch: Don't warn about if ((status = _xbegin()) == _XBEGIN

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Date:	Mon, 25 Mar 2013 14:39:21 +1100
From:	Michael Neuling <mikey@...ling.org>
To:	Andi Kleen <andi@...stfloor.org>
cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, x86@...nel.org,
	Andi Kleen <ak@...ux.intel.com>, apw@...onical.com
Subject: Re: [PATCH 06/29] checkpatch: Don't warn about if ((status = _xbegin()) == _XBEGIN_STARTED)

> From: Andi Kleen <ak@...ux.intel.com>
> 
> Writing _xbegin which is like setjmp in a if is very natural.
> Stop checkpatch's whining about this.

This patch should go in before the RTM tester.  

> 
> Cc: apw@...onical.com
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  scripts/checkpatch.pl |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index b28cc38..659e683 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2831,7 +2831,10 @@ sub process {
>  		    $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
>  			my ($s, $c) = ($stat, $cond);
>  
> -			if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
> +			# if ((status = _xbegin()) == _XBEGIN_STARTED) is natural,
> +			# so don't warn about this case.
> +			if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s &&
> +			    $c !~ /_xbegin/) {
>  				ERROR("ASSIGN_IN_IF",
>  				      "do not use assignment in if condition\n" . $herecurr);
>  			}
> -- 
> 1.7.7.6
> 
> --
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