pci_unmap_single() and CONFIG_NOT_COHERENT_CACHE

[Roland Dreier]

    Allen> I noticed in pci.h that pci_unmap_single() is a null
    Allen> function. (essentially does nothing) Shouldn't is call
    Allen> consistent_sync() so that flush_dcache_range() is called?

No, the cache invalidate or flush has to happen when pci_map_single()
is used.  There's nothing to do after the DMA is done (which is when
pci_unmap_single() gets called).

 - Roland

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