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 CEM+rKSS 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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 09/25/23 16:28, riel@surriel.com wrote: > From: Rik van Riel > > Extend the locking scheme used to protect shared hugetlb mappings > from truncate vs page fault races, in order to protect private > hugetlb mappings (with resv_map) against MADV_DONTNEED. The only time an anon hugetlb mapping would not have a resv_map would be in the case where MAP_NORESERVE was specified. In this case the user should be prepared for allocation failures. I am good with this approach not adding locking for the MAP_NORESERVE case. > Add a read-write semaphore to the resv_map data structure, and > use that from the hugetlb_vma_(un)lock_* functions, in preparation > for closing the race between MADV_DONTNEED and page faults. > > Signed-off-by: Rik van Riel > --- > include/linux/hugetlb.h | 6 ++++++ > mm/hugetlb.c | 41 +++++++++++++++++++++++++++++++++++++---- > 2 files changed, 43 insertions(+), 4 deletions(-) Reviewed-by: Mike Kravetz -- Mike Kravetz