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    SubjectRe: [PATCH [RT] 05/14] rearrange rt_spin_lock sleep

    * Gregory Haskins <gregory.haskins.ml@gmail.com> wrote:

    > My assumption is that the xchg() (inside update_current()) acts as an
    > effective wmb(). If xchg() does not have this property, then this
    > code is broken and patch 6/14 should also add a:

    xchg() is a strong implicit memory barrier, it implies smp_mb().
    (historic sidenote: it was the very first SMP primitive we had in
    Linux.)

    Ingo


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