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[Xen-devel] Re: [PATCH] xen: drop anti-dependency on X86_VISWS



>>> On 08.04.11 at 17:25, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> On 04/07/2011 11:38 PM, Ian Campbell wrote:
>> Is there any downside to this patch (is X86_CMPXCHG in the same sort of
>> boat?)
> 
> Only if we don't use cmpxchg in shared memory with other domains or the
> hypervisor.  (I don't think it will dynamically switch between real and
> emulated cmpxchg depending on availability.)

Actually it does - see the "#ifndef CONFIG_X86_CMPXCHG" section
in asm/cmpxchg_32.h.

Jan


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