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

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Message-ID: <4C3DFFB8.4070009@zytor.com>
Date:	Wed, 14 Jul 2010 11:19:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Palfrader <peter@...frader.org>,
	Avi Kivity <avi@...hat.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>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	"H.J. Lu" <hjl.tools@...il.com>
Subject: Re: [patch 134/149] x86, paravirt: Add a global synchronization point
 	for pvclock

On 07/14/2010 11:15 AM, Jeremy Fitzhardinge wrote:
> 
> I think we should consider that deprecated and rely on dependencies and
> clobbers.
> 

I don't think that's practical in general.  If the compiler is *that
broken*, I don't see how it is usable at all.

As Linus indicated, I don't think we can assume the gcc documentation to
accurately reflect the intent of the gcc team, mostly because I think it
often lags way behind what they're thinking.

	-hpa

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