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mm: prevent userfaults to be handled under per-vma lock
authorSuren Baghdasaryan <surenb@google.com>
Mon, 27 Feb 2023 17:36:26 +0000 (09:36 -0800)
committerAndrew Morton <akpm@linux-foundation.org>
Thu, 6 Apr 2023 03:03:01 +0000 (20:03 -0700)
commit444eeb17437a0ef526c606e9141a415d3b7dfddd
tree4a62168d40f3df1e5bd42084e790af170551a07ctree | snapshot
parent17c05f18e54158a3eed0c22c85b7a756b63dcc01commit | diff
mm: prevent userfaults to be handled under per-vma lock

Due to the possibility of handle_userfault dropping mmap_lock, avoid fault
handling under VMA lock and retry holding mmap_lock.  This can be handled
more gracefully in the future.

Link: https://lkml.kernel.org/r/20230227173632.3292573-28-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Suggested-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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