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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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