Messages in this thread | | | Date | Tue, 25 May 2004 15:01:55 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [PATCH] ppc64: Fix possible race with set_pte on a present PTE |
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On Tue, 25 May 2004, Andrea Arcangeli wrote: > > I expected the pal code to re-read the pte if the control bits asked for > page fault, like it must happen if the control bits are set to > non-present.
That may or may not be true. I _think_ it wasn't true.
> This latter this must be true or linux wouldn't run at all > on alpha.
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.
The PAL-code sources are out there somewhere, so I guess this should be easy to check if I wasn't so lazy.
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