* Ingo Molnar <[email protected]> wrote:
> CPU idle wakeup very much depends on ordered memory ops, the clearing
> of the TS_POLLING flag must always be done before we test
> need_resched() and hit the idle instruction(s). [Symmetrically, the
> wakeup code needs to set NEED_RESCHED before it tests the TS_POLLING
> flag, so memory ordering is paramount.]
Btw., this means that an smp_rmb() ought to be enough too. (I sent such
a test-patch to Fernando.) Also, i'd like the change to smp_rmb() be
done separately from the fix so that we have the most-conservative
variant in and thus it becomes bisectable. I'd like to avoid another few
months of latency for fixing yet another bug in this area...
Ingo
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