linux-kernel - Re: [patch 134/149] x86, paravirt: Add a global synchronization point for pvclock

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Date:	Tue, 27 Jul 2010 10:52:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Palfrader <peter@...frader.org>,
	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, stable-review@...nel.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Glauber Costa <glommer@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [patch 134/149] x86, paravirt: Add a global synchronization point
 	for pvclock

On 07/27/2010 10:46 AM, Jeremy Fitzhardinge wrote:
>  On 07/13/2010 11:15 AM, Linus Torvalds wrote:
>> On Tue, Jul 13, 2010 at 11:04 AM, Avi Kivity<avi@...hat.com>  wrote:
>>> Well, current upstream uses "m":
>> Yes, I'd expect current 2.6.34 to also show the same problem.
>>
>>> and works; I also failed to reproduce with 2.6.32.16.  So I expect some
>>> toolchain involvement.
>> And yes, I do believe it's likely a newer gcc that triggers it too,
>> otherwise we'd have seen more reports of it.
> 
> Did anyone get around to doing a proper fix for this?   I don't see one
> in tip.git or linux-2.6.git.  And it needs to get back into stable...
> 

I'll go ahead and write it up.

	-hpa

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

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