[PATCH] arm64: spinlock: serialise spin_unlock_wait against concurrent lockers

Peter Zijlstra peterz at infradead.org
Fri Dec 4 01:36:26 PST 2015

On Thu, Dec 03, 2015 at 09:22:07AM -0800, Paul E. McKenney wrote:
> On the added MBs,
> the only alternative I have been able to come up with has even more MBs,
> as in on every lock acquisition.  If I am missing something, please do
> not keep it a secret!

You're right. And I suppose mpe is still on the fence wrt switching PPC
over to RCsc lock order.. which would be all those extra MBs you talk

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