linux-kernel - Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include return register

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Date:	Fri, 16 Mar 2007 10:37:44 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andi Kleen <ak@....de>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include
 return register

Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>
>   
>> Fix a few clobbers to include the return register.  The clobbers set 
>> is the set of all registers modified (or may be modified) by the code 
>> snippet, regardless of whether it was deliberate or accidental.
>>     
>
> i guess we need these paravirt.h clobber fixes for v2.6.21 (VMI) too, 
> correct?

No, I don't think so.  These aren't gcc-style clobbers, but a marker in
the .parainstruction section about what registers may be clobbered by
the patched in code.   VMI doesn't use that info, and/or doesn't clobber
more than is allowed at each site, so it isn't an issue.

    J
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