netdev - Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

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Date:	Tue, 20 Mar 2007 12:33:10 +0100 (CET)
From:	Andreas Kleen <ak@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Zachary Amsden <zach@...are.com>, xen-devel@...ts.xensource.com,
	akpm@...ux-foundation.org, virtualization@...ts.osdl.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	chrisw@...s-sol.org, Andi Kleen <ak@....de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, anthony@...emonkey.ws,
	mingo@...e.hu, Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops	callsites to make them patchable

Am Di 20.03.2007 06:54 schrieb Jeremy Fitzhardinge <jeremy@...p.org>:

> Zachary Amsden wrote:
> > For VMI, the default clobber was "cc", and you need a way to allow
> > at
> > least that, because saving and restoring flags is too expensive on
> > x86.
>
> According to lore (Andi, I think), asm() always clobbers cc.

asm with input and/or output. I'm not sure about asms without that.

-Andi


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