linux-kernel - Re: [PATCH] kmemcheck: fix sparse warning

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Date:	Thu, 9 Jul 2009 09:00:02 +0200
From:	Hannes Eder <hannes@...neseder.net>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	Linux Torvalds <torvalds@...ux-foundation.org>,
	Johannes Berg <johannes@...solutions.net>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-sparse@...r.kernel.org
Subject: Re: [PATCH] kmemcheck: fix sparse warning

On Thu, Jul 9, 2009 at 08:29, Josh Triplett<josh@...htriplett.org> wrote:
> [Adding Linus and Chris Li to CC; Linus for further background on
> -Wdo-while, and Chris Li for Sparse.]
>
> On Wed, Jul 08, 2009 at 09:28:24PM +0200, Vegard Nossum wrote:
>> 2009/7/6 Johannes Berg <johannes@...solutions.net>:
>> > Whether or not the sparse warning
>> >
>> > warning: do-while statement is not a compound statement
>> >
>> > is justified or not in this case, it is annoying and
>> > trivial to fix.
> [...]
>>
>> I'll change the patch title to "kmemcheck: work around bogus sparse
>> warning" and fix the indentation, sounds ok?
>>
>> Meanwhile, I Cced sparse mailing list in case somebody else knows
>> anything else about this warning (what it means, whether it's
>> justified in this case, whether it should be fixed in sparse, etc.).
>
> -Wdo-while gives a warning if you write:
>
> do
>    statement
> while (...);
>
> where "statement" does not consist of a compound statement surrounded by
> braces.  As far as I know, this warning exists primarily because it
> matched Linus's preference for readability.

see:
http://lkml.org/lkml/2008/12/23/180

an related messages/threads

Cheers,
-Hannes
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