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

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Date:	Wed, 10 Apr 2013 18:07:17 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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, 2013-04-10 at 15:57 -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".

And about all of them in are staging, where I think they
really should be fixed.

$ find . -maxdepth 2 -type d \
   while read file ; do \
      echo "$(git grep -E '(==|\!=)\s*(true|false)' $file | wc -l)  $file"; \
  done | sort -rn | head -10
1375 .
1298 ./drivers
1055 ./drivers/staging
63 ./drivers/net
59 ./drivers/gpu
24 ./net
20 ./drivers/media
17 ./net/nfc
13 ./fs
11 ./drivers/usb

> That's a lot of people to shout at.

Not really.

>  Is it really worthwhile? 

I think so.


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