linux-kernel - Re: [PATCH] checkpatch: Suggest using min_t or max

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Message-Id: <20110525165345.5f775c7b.akpm@linux-foundation.org>
Date:	Wed, 25 May 2011 16:53:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Andy Whitcroft <apw@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] checkpatch: Suggest using min_t or max_t

On Tue, 24 May 2011 17:11:13 -0700
Joe Perches <joe@...ches.com> wrote:

> On Tue, 2011-05-24 at 16:35 -0700, Andrew Morton wrote:
> > On Fri, 20 May 2011 13:24:48 -0700
> > Joe Perches <joe@...ches.com> wrote:
> > 
> > > A common issue with min() or max() is using a cast on
> > > one or both of the arguments when using min_t/max_t could
> > > be better.
> > > 
> > > Add cast detection to uses of min/max and suggest an
> > > appropriate use of min_t or max_t instead.
> > 
> > Causes this:
> > 
> > akpm2:/usr/src/25> perl scripts/checkpatch.pl patches/drivers-gpio-vx855_gpioc-needs-slabh.patch
> > Nested quantifiers in regex; marked by <-- HERE in m/(\((?:[^\(\)]++ <-- HERE |(?-1))*\))/ at scripts/checkpatch.pl line 271.
> 
> Something not making sense here.
> I get no report when I try your patch.
> (using checkpatch with the regex I sent)
> 
> Send the patch again?
> 
> $ perl --version
> 
> This is perl, v5.10.1 (*) built for i686-linux-gnu-thread-multi
> (with 53 registered patches, see perl -V for more detail)
> 

It happens with perl v5.8.8:

akpm2:/usr/src/25> perl scripts/checkpatch.pl this-file-does-not-exist
Nested quantifiers in regex; marked by <-- HERE in m/(\((?:[^\(\)]++ <-- HERE |(?-1))*\))/ at scripts/checkpatch.pl line 271.



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