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Re: [Xen-devel] [PATCH 1/4] VT-d/qinval: make local variable used for communication with IOMMU "volatile"

>>> On 16.06.14 at 14:55, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 16/06/14 13:47, Jan Beulich wrote:
>> Without that there is - afaict - nothing preventing the compiler from
>> putting the variable into a register for the duration of the wait loop.
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> I seem to remember Tim saying that behaviour like this is covered by
> -fno-strict-aliasing

Afaik it would be if the variable was not an automatic one.


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