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

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Date:	Fri, 25 Mar 2011 09:45:58 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	dvhart@...ux.intel.com, torvalds@...ux-foundation.org,
	peterz@...radead.org, akpm@...ux-foundation.org,
	rostedt@...dmis.org, srostedt@...hat.com, tglx@...utronix.de,
	laijs@...fujitsu.com, mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/urgent] WARN_ON_SMP(): Allow use in if() statements on UP

On Fri, Mar 25, 2011 at 3:48 AM, tip-bot for Steven Rostedt
<srostedt@...hat.com> wrote:
> -# define WARN_ON_SMP(x)                        do { } while (0)
> +# define WARN_ON_SMP(x)                        ({0;})

That's a VERY odd way of writing "0".

Am I missing something subtle?

                        Linus
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