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Jes Sorensen writes:
> Thats easy
> This way you automatically get support for the situation Ben mentioned
> as well, when doing large allocs and the IOMMU is full you return a
> full 64 bit address.

And when the IOMMU is "full" what happens to all the SAC only
cards in the machine? pci_map_{single,sg}() are not allowed
to fail.

See, it's not so easy.

David S. Miller
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