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[Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable
- To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
- From: Andreas Kleen <ak@xxxxxxx>
- Date: Tue, 20 Mar 2007 12:33:10 +0100 (CET)
- Cc: Zachary Amsden <zach@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Andi Kleen <ak@xxxxxx>, netdev@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, David Miller <davem@xxxxxxxxxxxxx>, chrisw@xxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, anthony@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, mingo@xxxxxxx
- Delivery-date: Tue, 20 Mar 2007 04:33:03 -0700
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
Am Di 20.03.2007 06:54 schrieb Jeremy Fitzhardinge <jeremy@xxxxxxxx>:
> 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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