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    SubjectRe: [PATCH] x86-64: adjust pmd_bad()
    On Wed, 15 Nov 2006, Jan Beulich wrote:

    > Make pmd_bad() symmetrical to pgd_bad() and pud_bad(). At once,
    > simplify them all.

    Symmetrical and simpler, yes, but you're weakening the pmd_bad() test:
    no longer requires that all those _KERNPG_TABLE bits be set. Wouldn't
    it be better to go the other way and strengthen pgd_bad, pud_bad?

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