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SubjectRe: alpha iommu fixes

On the topic of to the PCI DMA code: one thing I'm missing
are pci_map_single()/pci_map_sg() that take struct page * instead of
of direct pointers. Currently I don't see how you would implement IO-MMU IO
on a 32bit box with more than 4GB of memory, because the address won't
fit into the pointer.

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