Re: [PATCH 4/4] locking: Introduce smp_cond_acquire()

[Peter Zijlstra]

On Thu, Nov 12, 2015 at 06:40:04AM -0800, Paul E. McKenney wrote:
> I cannot resist suggesting that any lock that interacts with
> spin_unlock_wait() must have all relevant acquisitions followed by
> smp_mb__after_unlock_lock().

Ha! that would certainly help here. But it would mean that argh64v8 also
needs to define that, even though that is already RCsc.
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