linux-kernel - Re: add memset checks to checkpatch.pl

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Date:	Wed, 18 Aug 2010 14:32:13 -0700
From:	Joe Perches <joe@...ches.com>
To:	Dave Jones <davej@...hat.com>
Cc:	apw@...onical.com, Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: add memset checks to checkpatch.pl

On Wed, 2010-08-18 at 16:40 -0400, Dave Jones wrote:
> Occasionally someone goofs the argument order to memset.
> This patch makes checkpatch catch those.
> 
> I made memset with size of 0 an error, because it's never correct,
> whereas memset with a size of 1 isn't technically an incorrect
> thing to do so I left it as a warning. It may still be better to replace
> it with a single variable assignment in the false positive cases.

Maybe something like allows more flexible checking?

	if ($line =~ /\bmemset\s*\(\s*($Lval)\s*,\s*($Lval)\s*,\s*($Lval)\s*\)/) {
		my $memset_addr = $1;
		my $memset_val = $2;
		my $memset_size = $3;
		if ($memset_size =~ /(0x|)0$/i) {
			ERROR("memset uses second argument as constant byte value, not third.\n" . $herecurr);
		elsif ($memset_size =~ /(0x|)1/i) {
			WARN("single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . $herecurr);
		}
	}


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