linux-kernel - Re: make checkpatch warn about memset with swapped arguments.

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Message-ID: <20110317193645.GD14675@home.goodmis.org>
Date:	Thu, 17 Mar 2011 15:36:45 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: make checkpatch warn about memset with swapped arguments.

On Thu, Mar 17, 2011 at 12:52:09AM -0400, Dave Jones wrote:
> Because the second and third arguments of memset have the same type,
> it turns out to be really easy to mix them up.
> 
> This bug comes up time after time, so checkpatch should really
> be checking for it at patch submission time.
> 
> Signed-off-by: Dave Jones <davej@...hat.com>
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 58848e3..421b3e69 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2902,6 +2902,11 @@ sub process {
>  		    $line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
>  			WARN("Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
>  		}
> +
> +		# Check for memset with swapped arguments
> +		if ($line =~ /memset.*\,(\ |)(0x|)0(\ |0|)\);/) {

Wouldn't this be a better regex:

	if ($line =~ /memset.*\,\s*(0x)?0\s*\)\s*;/)

-- Steve

> +			ERROR("memset size is 3rd argument, not the second.\n" . $herecurr);
> +		}
>  	}
>  
>  	# If we have no input at all, then there is nothing to report on
> --
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