linux-kernel - Re: Possible false positive from checkpatch.pl

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Message-ID: <20100714131447.GC20746@shadowen.org>
Date:	Wed, 14 Jul 2010 14:14:47 +0100
From:	Andy Whitcroft <apw@...onical.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Possible false positive from checkpatch.pl

On Mon, Jul 12, 2010 at 12:49:07PM -0700, Joe Perches wrote:
> On Mon, 2010-07-12 at 14:37 -0500, Larry Finger wrote:
> > On 07/12/2010 02:03 PM, Joe Perches wrote:
> > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > > index bd88f11..7e8a3f4 100755
> > > --- a/scripts/checkpatch.pl
> > > +++ b/scripts/checkpatch.pl
> > > @@ -2394,8 +2394,10 @@ sub process {
> > >   			}x;
> > >   			#print "REST<$rest>  dstat<$dstat>\n";
> > >   			if ($rest ne '') {
> > > -				if ($rest !~ /while\s*\(/&&
> > > -				    $dstat !~ /$exceptions/)
> > > +				if ($rest eq ",") {
> > > +					ERROR("Macros should not end with a trailing comma\n" . "$here\n$ctx\n");
> > > +				} elsif ($rest !~ /while\s*\(/&&
> > > +					 $dstat !~ /$exceptions/)
> > >   				{
> > >   					ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
> > >   			}
> > 
> > That looks good. At least it makes clear what is wrong.
> > Should it be an error, or just a warning?
> 
> I don't much care.
> 
> If Andy wants to do anything, let him decide.
> 
> Perhaps the new test should be
> 	if ($rest =~ /\s*,\s*$/)

I am not sure these are even invalid are they?  Macro abuse of this sort
is always going to throw up exceptions.  Hrmm.

-apw
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