[PATCH 2/8] powerpc/pseries: use smp_rmb() in H_CONFER spin yield

[Peter Zijlstra]

On Thu, Jul 02, 2020 at 05:48:33PM +1000, Nicholas Piggin wrote:
> There is no need for rmb(), this allows faster lwsync here.

Since you determined this; I'm thinking you actually understand the
ordering here. How about recording this understanding in a comment?

Also, should the lock->slock load not use READ_ONCE() ?