Re: [PATCH -tip 2/3] sched/wake_q: Relax to acquire semantics

[Peter Zijlstra]

On Tue, Sep 15, 2015 at 05:41:42AM -0700, Paul E. McKenney wrote:
> > Never mind, the PPC people will implement this with lwsync and that is
> > very much not transitive IIRC.
> 
> I am probably lost on context, but...
> 
> It turns out that lwsync is transitive in special cases.  One of them
> is a series of release-acquire pairs, which can extend indefinitely.
> 
> Does that help in this case?

Probably not, but good to know. I still don't think we want to rely on
ACQUIRE/RELEASE being transitive in general though.
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