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H A D | mmap.c | diff eeff9a5d47f89bc641034fea05501c8a6de131cb Mon Feb 27 18:36:20 CET 2023 Suren Baghdasaryan <surenb@google.com> mm/mmap: prevent pagefault handler from racing with mmu_notifier registration
Page fault handlers might need to fire MMU notifications while a new notifier is being registered. Modify mm_take_all_locks to write-lock all VMAs and prevent this race with page fault handlers that would hold VMA locks. VMAs are locked before i_mmap_rwsem and anon_vma to keep the same locking order as in page fault handlers.
Link: https://lkml.kernel.org/r/20230227173632.3292573-22-surenb@google.com Signed-off-by: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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