linux-kernel - Re: [GIT PULL] x86/cpu changes for v2.6.34

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Message-ID: <4B897A7D.9040108@zytor.com>
Date:	Sat, 27 Feb 2010 12:03:09 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <borislav.petkov@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] x86/cpu changes for v2.6.34

On 02/27/2010 09:10 AM, Arjan van de Ven wrote:
> On Sat, 27 Feb 2010 16:09:42 +0100
> Ingo Molnar <mingo@...e.hu> wrote:
> 
>> +int wbinvd_on_all_cpus(void)
>> +{
>> +	return on_each_cpu(__wbinvd, NULL, 1);
>> +}
> 
> does this make sense at all?
> 
> doesn't cache coherency on x86 already guarantee this?
> 

No, WBINVD (unlike CLFLUSH) is local to one CPU.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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