[PATCH 1/2] OProfile - Enable SPU switch notification to detect currently active SPU tasks - update

[Paul Mackerras]

Andrew Morton writes:

> I still wonder about that barrier.  At the least it should be smp_mb(). 
> But aren't our set_bit() semantics _alone_ sufficient to make this barrier
> unneeded?

No, but our wake_up semantics certainly ought to be, if they aren't
already.  It's the wake_up which implies synchronization with other
tasks, not the set_bit.

Paul.