Linus Torvalds wrote:
quoted text
> You should have used a pagetable-specific macro, becuse PAGE_MASK is 
> simply fundamentally WRONG, and has absolutely nothing to do with the PFN 
> bits, whether sign-extended or not!
>
> The fact is, the page frane number bits are *not* ~PAGE_MASK or anything 
> like that. They share only the low bits - not the high bits.

Yes.  There's already a PTE_MASK for masking out the PFN vs the flags in 
a pte, but it isn't used consistently (perhaps at all).

    J
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