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SubjectRe: pat support in the kernel
Andi Kleen writes:
> writes:
> > (Large pages ignoring PAT index bit 2, or something like that.)
> change_page_attr will force 4K pages for these anyways, so for the kernel
> direct mapping it should not be an issue.
> For the hugetlbfs user mapping you may need to check the case, but
> it's probably reasonable to EINVAL there.
> Other than that everything should be 4K mapped.

The bug is that 4K pages get the wrong PAT index; the large page
thing is the trigger but the large pages themselves arent' affected.

So 4K pages need to be restricted to the low 4 PAT types.
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