From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <ak@suse.de>
Subject: Re: [patch] pae: tlbflush linear page table updates
Date: 12 Aug 2005 11:20:42 +0200
Message-ID: <p73y877340l.fsf@verdi.suse.de>
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	<2636b1d92088eaa5eb1c4e84ef120688@cl.cam.ac.uk>
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To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: Gerd Knorr <kraxel@suse.de>, xen-devel@lists.xensource.com, kevin.tian@intel.com
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Keir Fraser <Keir.Fraser@cl.cam.ac.uk> writes:
> 
> The compiler will never alias inputs. In this case it is forced to
> alias the output constraint with input retval, and so the output
> cannot alias with any other input (which would be an error).

Actually it will sometimes. That is what the "early clobber" (&) 
prevents. Perhaps it should be used here.

-Andi