linux-kernel - Re: [tip:core/urgent] WARN_ON_SMP(): Allow use in if() statements on UP

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Message-ID: <1301082034.14261.202.camel@gandalf.stny.rr.com>
Date:	Fri, 25 Mar 2011 15:40:34 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org,
	dvhart@...ux.intel.com, peterz@...radead.org,
	akpm@...ux-foundation.org, srostedt@...hat.com, tglx@...utronix.de,
	laijs@...fujitsu.com, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/urgent] WARN_ON_SMP(): Allow use in if() statements
 on UP

On Fri, 2011-03-25 at 21:31 +0200, Alexey Dobriyan wrote:

> > Would you like me to add a comment that states:
> > 
> > 	/*
> > 	 * Use ({0;}) as just "0" will cause gcc to output:
> > 	 *   warning: statement with no effect
> > 	 */
> 
> Try ((void)0)

Maybe I should update the comment to stop further confusion:

	/*
	 * Use ({0;}) as it works nicely in both an if statement and
	 * as a stand alone line statement.
	 *   "0;" causes "warning: statement with no effect"
	 *   ((void)0) does not work in an if () condition.
	 */

-- Steve


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