From: "H. Peter Anvin" <hpa@zytor.com>
To: Joe Perches <joe@perches.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>,
linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org,
Dave Jones <davej@redhat.com>,
Greg Kroah-Hartman <gregkh@suse.de>,
Ingo Molnar <mingo@redhat.com>,
x86@vger.kernel.org, Len Brown <len.brown@intel.com>,
Mike Travis <travis@sgi.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Thomas Gleixner <tglx@linutronix.de>,
Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Subject: Re: [PATCH 1/3] kernel.h: Add DO_ONCE statement expression macro
Date: Thu, 21 May 2009 16:36:41 -0700 [thread overview]
Message-ID: <4A15E589.2030003@zytor.com> (raw)
In-Reply-To: <1242948762.3373.143.camel@Joe-Laptop.home>
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
next prev parent reply other threads:[~2009-05-21 23:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-21 23:00 [PATCH 0/3] Introduce and use " Joe Perches
2009-05-21 23:00 ` [PATCH 1/3] kernel.h: Add " Joe Perches
2009-05-21 23:27 ` Randy Dunlap
2009-05-21 23:32 ` Joe Perches
2009-05-21 23:36 ` H. Peter Anvin [this message]
2009-05-21 23:41 ` Alan Cox
2009-05-22 0:27 ` Al Viro
2009-05-22 1:09 ` Joe Perches
2009-05-25 6:45 ` Rusty Russell
2009-05-26 2:42 ` Andrew Morton
2009-05-21 23:00 ` [PATCH 2/3] arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c: Use DO_ONCE & spelling fix Joe Perches
2009-05-21 23:26 ` Dave Jones
2009-05-21 23:34 ` Joe Perches
2009-05-21 23:47 ` Dave Jones
2009-05-21 23:52 ` Joe Perches
2009-05-21 23:00 ` [PATCH 3/3] kernel.h: Remove unused printk_once Joe Perches
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