linux-kernel - Re: [PATCH 1/3] kernel.h: Add DO_ONCE statement expression macro

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Message-ID: <4A15E589.2030003@zytor.com>
Date:	Thu, 21 May 2009 16:36:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Joe Perches <joe@...ches.com>
CC:	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org,
	Dave Jones <davej@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...r.kernel.org,
	Len Brown <len.brown@...el.com>, Mike Travis <travis@....com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH 1/3] kernel.h: Add DO_ONCE statement expression macro

Joe Perches wrote:
> 
> Add a DO_ONCE statement expression analogous to printk_once
> that executes any arbitrary statement exactly once.
> 

If you're truly going to make that guarantee you should use an atomic
test and set.

	-hpa
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