Re: add memset checks to checkpatch.pl

[Joe Perches <joe@perches.com>]

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);
		}
	}