Re: [PATCH] ppc64: Fix possible race with set_pte on a present PTE

[Ivan Kokshaysky]

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."

Ivan.
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