[RFC v2 5/7] powerpc: atomic: Implement cmpxchg{,64}_* and atomic{,64}_cmpxchg_* variants

[Peter Zijlstra]

On Thu, Oct 01, 2015 at 08:12:19AM -0700, Paul E. McKenney wrote:

> What C11 does is to allow the developer to specify different orderings
> on success and failure.  But it is no harder to supply a barrier (if
> needed) on the failure path, right?

Quite right.