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mm: prevent do_swap_page from handling page faults under VMA lock
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. Link: https://lkml.kernel.org/r/20230227173632.3292573-27-surenb@google.com Signed-off-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Laurent Dufour <laurent.dufour@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -3697,6 +3697,11 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
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if (!pte_unmap_same(vmf))
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goto out;
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if (vmf->flags & FAULT_FLAG_VMA_LOCK) {
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ret = VM_FAULT_RETRY;
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goto out;
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}
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entry = pte_to_swp_entry(vmf->orig_pte);
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if (unlikely(non_swap_entry(entry))) {
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if (is_migration_entry(entry)) {
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