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    SubjectRe: [PATCH] Define wc_wmb, a write barrier for PCI write combining
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        Jes> Could you explain why the current mmiowb() API won't suffice
    Jes> for this? It seems that this is basically trying to achieve
    Jes> the same thing.

    I don't believe mmiowb() is at all the same thing. mmiowb() is all
    about ordering writes between _different_ CPUs without incurring the
    cost of flushing posted writes by issuing a read on the bus. wc_wmb()
    would just act like a true wmb(), even when using write-combining
    regions on x86 -- in other words, there would be no cross-CPU synchronization.

    - R.
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