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.