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    SubjectRe: [PATCH] ppc64: Fix possible race with set_pte on a present PTE
    On Tue, May 25, 2004 at 03:01:55PM -0700, Linus Torvalds wrote:
    > A "not-present" fault is a totally different fault from a "protection
    > fault". Only the not-present fault ends up walking the page tables, if I
    > remember correctly.

    Precisely. The architecture reference manual says:
    "Additionally, when the software changes any part (except the software
    field) of a *valid* PTE, it must also execute a tbi instruction."

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