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    SubjectRe: PCI DMA to small buffers on cache-incoherent arch
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       From: Oliver Neukum <oliver@neukum.name>
    Date: Mon, 10 Jun 2002 12:00:14 +0200

    > You flush either before/after depending upon whether the cpu caches
    > are writeback in nature or not, and the cpu is not allowed to touch
    > those addresses while the device is doing the DMA.

    So we need some kind of cache_aligned macro in our USB data
    structures if they contain a buffer. Which macro would we have to use ?

    For now use SMP_CACHE_BYTES I guess.
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