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SubjectRe: alpha iommu fixes

Andi Kleen writes:
> How about a new function (pci_nonrepresentable_address() or whatever)
> that returns true when page cache contains pages that are not representable
> physically as void *. On IA32 it would return true only if CONFIG_PAE is
> true and there is memory >4GB.

No, if we're going to change anything, let's do it right.

Sure, you'll make this one check "portable", but the guts of the
main ifdef stuff for DAC support is still there.

I'd rather live with the hackish stuff temporarily, and get this all
cleaned up in one shot when we have a real DAC support API.

David S. Miller
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