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    SubjectRe: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it

    On Wed, 6 Dec 2006, Al Viro wrote:
    > No. sparc32 doesn't have one, for instance.

    Ok. For SMP-safety, it's important that any architecture that can't do
    this needs to _share_ the same spinlock (on SMP only, of course) that it
    uses for the bitops.

    It would be good (but perhaps not as strict a requirement) if the atomic
    counters also use the same lock. But that is probably impossible on
    sparc32 (since it has a per-counter "lock"-like thing, iirc). So doing a
    cmpxchg() on an atomic_t would be a bug.

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