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SubjectRe: alpha iommu fixes

Andrea Arcangeli writes:
> > [..] Even sparc64's fancy
> > iommu-based pci_map_single() always succeeds.
>
> Whatever sparc64 does to hide the driver bugs you can break it if you
> pci_map 4G+1 bytes of phyical memory.

Which is an utterly stupid thing to do.

Please construct a plausable situation where this would occur legally
and not be a driver bug, given the maximum number of PCI busses and
slots found on sparc64 and the maximum _concurrent_ usage of PCI dma
space for any given driver (which isn't doing something stupid).

Later,
David S. Miller
davem@redhat.com
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