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    SubjectRe: MMIO and gcc re-ordering issue
    > It's just another complicated thing for driver authors to get wrong.
    > The other side of the coin is of course the cost.
    >
    > The only thing I am absolutely sure of is that we should make a
    > decision fast, document it, and just stick to it.

    It's unfortunate that the __read/___write versions have other different
    semantics. The default should definitely be ordered but having un-ordered
    ones as an option would be good for zapping the hot paths that matter.

    Most I/O paths aren't even worth the thinking time for non-ordered I/O.

    Alan


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