| Date | Mon, 29 Aug 2022 21:25:22 +0000 | Subject | [RFC PATCH 19/28] mm: disallow do_swap_page to handle page faults under VMA lock | From | Suren Baghdasaryan <> |
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Due to the possibility of do_swap_page dropping mmap_lock, abort fault handling under VMA lock and retry holding mmap_lock. This can be handled more gracefully in the future.
Signed-off-by: Suren Baghdasaryan <surenb@google.com> --- mm/memory.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/mm/memory.c b/mm/memory.c index 9ac9944e8c62..29d2f49f922a 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3738,6 +3738,11 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) vm_fault_t ret = 0; void *shadow = NULL; + if (vmf->flags & FAULT_FLAG_VMA_LOCK) { + ret = VM_FAULT_RETRY; + goto out; + } + if (!pte_unmap_same(vmf)) goto out; -- 2.37.2.672.g94769d06f0-goog
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