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

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Date:	Tue, 13 Jul 2010 20:25:27 +0200
From:	Peter Palfrader <peter@...frader.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	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>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [patch 134/149] x86, paravirt: Add a global synchronization
	point for pvclock

On Tue, 13 Jul 2010, Avi Kivity wrote:

> Well, current upstream uses "m":
>
>>         case 8:                                                         \
>>                 asm volatile(lock "cmpxchgq %1,%2"                      \
>>                              : "=a"(__ret)                              \
>>                              : "r"(__new), "m"(*__xg(ptr)), "0"(__old)  \
>>                              : "memory");                               \
>>                 break;                                                  \
>
> and works; I also failed to reproduce with 2.6.32.16.  So I expect some  
> toolchain involvement.
>
> Peter, what gcc are you using?

gcc (Debian 4.3.2-1.1) 4.3.2

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