Messages in this thread | | | Date | Thu, 5 Feb 2009 15:56:06 -0500 | From | wli@movement ... | Subject | Re: pud_bad vs pud_bad |
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On Thu, 5 Feb 2009, wli@movementarian.org wrote: >> The RW bit needs to be allowed to become read-only for hugetlb COW. >> Changing it over to the 32-bit method is a bugfix by that token.
On Thu, Feb 05, 2009 at 08:14:42PM +0000, Hugh Dickins wrote: > If there's a bugfix to be made there, of course I'm in favour: > but how come we've never seen such a bug? hugetlb COW has been > around for a year or two by now, hasn't it?
We can tell from the code that a write-protected pte mapping of a 1GB hugetlb page would be flagged as bad. It must not be called on ptes mapping hugetlb pages if they're not getting flagged.
-- wli
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