linux-kernel - Re: [PATCH] checkpatch: Warn on comparisons to true and false

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Message-ID: <20130411081943.GA6772@mwanda>
Date:	Thu, 11 Apr 2013 11:19:43 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>,
	Andy Whitcroft <apw@...dowen.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH] checkpatch: Warn on comparisons to true and false

On Wed, Apr 10, 2013 at 10:14:15PM -0400, Dave Jones wrote:
> On Wed, Apr 10, 2013 at 03:57:51PM -0700, Andrew Morton wrote:
>  > On Tue, 09 Apr 2013 20:17:14 -0700 Joe Perches <joe@...ches.com> wrote:
>  > 
>  > > Comparisons of A to true and false are better written
>  > > as A and !A.
>  > > 
>  > > Bleat a message on use.
>  > 
>  > hm.  I'm counting around 1,100 instances of "== true" and "== false".
>  > 
>  > That's a lot of people to shout at.  Is it really worthwhile? 
>  > "foo==true" is a bit of a waste of space but I can't say that I find it
>  > terribly offensive.
> 
> It would be interesting to see how many people have historically screwed 
> up and used (!a) when they mean (a) and vice versa, versus spelling
> it out longform.  I'd be surprised if the results weren't skewed
> in favour of the more verbose form.

I see a the occasional reversed test in Smatch but normally these
kind of bugs are detected with basic testing so they are rare.

regards,
dan carpenter

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