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SubjectRe: [patch] 2.4.4 alpha semaphores optimization
> > If you do
> > (perhaps to coordinate with devices) then the barriers are required.
>
> For IO space access mb's are required, but ll/sc are of no use, AFAIK.

Ugh. You are right, of course. I forgot that drivers are also using
atomic.h, and the intelligent device could be counted as another CPU
to some degree...

Thanks for the __builtin_expect fix!

Ivan.
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