Messages in this thread | | | Date | Fri, 30 Sep 2016 14:51:13 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH locking/Documentation 1/2] Add note of release-acquire store vulnerability |
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On Fri, Sep 30, 2016 at 05:14:03AM -0700, Paul E. McKenney wrote: > PowerPC does not "obscure" stores, so both stores really are there and > the lwsync really has effect on all CPUs. From what I understand, even > CPUs that do obscure stores only do so in the case of repeated stores > by the same CPU to the same variable, and the above litmus test doesn't > have this. > > So all the stores happen, and each CPU's stores are at least locally > ordered.
OK, when I'm not sure I ever understood the case where smp_wmb() went wonky on PPC, sadly I cannot now find the email where you mentioned that :/
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