Re: [gcv v3 27/35] arm: Replace __get_cpu_var uses

[Christoph Lameter]

On Wed, 4 Sep 2013, Will Deacon wrote:

> On ARM, yes. I'm worried that there may be an architecture where the change-
> or-fail operation would only fail if the access from the interrupt handler
> *also* used that change-or-fail instruction, which isn't the case with
> this_cpu_inc.
>
> I have no idea if such an architecture exists :)

Atomic operations use atomic_t. this_cpu operations can only use regular
scalars. So the set of variables that are updated by each should be
distinct.



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