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 oW8WIzCw 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 04/13/23 19:11, Peter Xu wrote: > There're a bunch of things that were wrong: > > - Reading uffd-wp bit from a swap entry should use pte_swp_uffd_wp() > rather than huge_pte_uffd_wp(). That was/is quite confusing to me at least. > > - When copying over a pte, we should drop uffd-wp bit when > !EVENT_FORK (aka, when !userfaultfd_wp(dst_vma)). > > - When doing early CoW for private hugetlb (e.g. when the parent page was > pinned), uffd-wp bit should be properly carried over if necessary. > > No bug reported probably because most people do not even care about these > corner cases, but they are still bugs and can be exposed by the recent unit > tests introduced, so fix all of them in one shot. > > Cc: linux-stable > Fixes: bc70fbf269fd ("mm/hugetlb: handle uffd-wp during fork()") > Signed-off-by: Peter Xu > --- > mm/hugetlb.c | 26 ++++++++++++++++---------- > 1 file changed, 16 insertions(+), 10 deletions(-) No issues except losing information in pte entry as pointed out by Mika. -- Mike Kravetz