[Xen-devel] Re: [patch] pae: tlbflush linear page table updates

[Andi Kleen <ak@xxxxxxx>]

Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> 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 

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