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

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Date:	Thu, 01 Mar 2007 17:18:11 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
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>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include
 return register

Jeremy Fitzhardinge wrote:
> 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).
>   

Ah, ok.  I didn't think gcc had grown the appropriate antlers yet to 
allow outputs in the clobber list.  But the paravirt-clobbers, yes that 
makes sense.

Zach
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