Messages in this thread | | | Date | Fri, 18 Sep 2015 17:59:02 +0100 | From | Will Deacon <> | Subject | Re: [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants |
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On Wed, Sep 16, 2015 at 04:49:31PM +0100, Boqun Feng wrote: > On powerpc, we don't need a general memory barrier to achieve acquire and > release semantics, so __atomic_op_{acquire,release} can be implemented > using "lwsync" and "isync".
I'm assuming isync+ctrl isn't transitive, so we need to get to the bottom of the s390 thread you linked me to before we start spreading this further:
https://lkml.org/lkml/2015/9/15/836
Will
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