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    SubjectRe: Missing cache flush.

    Jeff Garzik writes:
    > David Woodhouse wrote:
    > > I was pointed at Documentation/DMA-mapping.txt but that doesn't seem very
    > > helpful - it's very PCI-specific, and a quick perusal of pci_dma_sync() on
    > > i386 shows that it doesn't do what's required anyway.
    >
    > What should it do on i386? mb()?

    The x86 doesn't have dumb caches, therefore it really doesn't need to
    flush anything. Maybe a mb(), but that is it.

    Later,
    David S. Miller
    davem@redhat.com
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