Re: pud_bad vs pud_bad

[Jeremy Fitzhardinge <jeremy@goop.org>]

Hugh Dickins wrote:
> However... I forget how the folding works out.  The pgd in the 32-bit
> PAE case used to have just the pfn and the present bit set in that
> little array of four entries: if pud_bad() ends up getting applied
> to that, I guess it will blow up.
>   

Ah, that's a good point.

> If so, my preferred answer would actually be to make those 4 entries
> look more like real ptes; but you may think I'm being a bit silly.
>   

Hardware doesn't allow it.  It will explode (well, trap) if you set 
anything other than P in the top level.

By the by, what are the chances we'll be able to deprecate non-PAE 32-bit?

    J