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    SubjectRe: [PATCH -tip/core/rcu 1/6] Cleanups and fixes for RCU in face of heavy CPU-hotplug stress

    * Mathieu Desnoyers <> wrote:

    > I would not trust this architecture for synchronization tests.
    > There has been reports of a hardware bug affecting the cmpxchg
    > instruction in the field. The load fence normally implied by the
    > semantic seems to be missing. AFAIK, AMD never acknowledged the
    > problem.

    If cmpxchg was broken i'd be having far worse problems and very
    widely so.

    FYI, this was the same box i prototyped/developed -rt on, which uses
    cmpxchg for _everything_.

    That's not a proof of course (it's near impossible to prove the lack
    of a bug), but it's sure a strong indicator and you'll need to
    provide far more proof of misbehavior before i discount a bona fide
    regression on this box.


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