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[Xen-devel] Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers

To: Zachary Amsden <zach@xxxxxxxxxx>
Subject: [Xen-devel] Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include return register
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Thu, 01 Mar 2007 16:58:56 -0800
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
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Zachary Amsden wrote:
>> Things like what?  Do you mean the %[foo] asm parameter syntax?  I think
>> those versions are no longer supported - Arjan posted a patch a few days
>> ago to convert a pile of asms to this form.  Or do you mean something
>> else?
> I meant having an output in the clobber list,

There's no output in the clobber list, just "memory" and "cc".  The
paravirt_clobber() is the stuff which gets put in the .parainstructions
section which tells the patcher what registers are expected to be
modified at that callsite (including both temp and output registers).


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