linux-kernel - Re: [PATCH] checkpatch giving bogus advice (was staging: goldfish: Fix minor coding style)

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Message-ID: <20141215134334.GE4856@mwanda>
Date:	Mon, 15 Dec 2014 16:43:34 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jeremiah Mahler <jmmahler@...il.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Loic Pefferkorn <loic@...cp.eu>, gregkh@...uxfoundation.org,
	alan@...ux.intel.com, jun.j.tian@...el.com,
	octavian.purdila@...el.com, nnk@...gle.com,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	apw@...onical.com, joe@...ches.com
Subject: Re: [PATCH] checkpatch giving bogus advice (was staging: goldfish:
 Fix minor coding style)

On Mon, Dec 15, 2014 at 05:03:46AM -0800, Jeremiah Mahler wrote:
> 
> Or another way mentioned in K&R that produces a compile error
> 
>             if (NULL = x) 
> 

Yes.  People used to write Yoda code back in the day.  Don't ever do
this in the kernel.

1) It looks stupid.
2) GCC will catch most == vs = bugs as Alan pointed out.
3) There are still some that sneak through because people put double
   parenthesis around everything like "if ((foo = NULL) || (...)) {",
   but checkpatch.pl and Smatch will catch those.

regards,
dan carpenter

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