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UPSTREAM: mm: prevent do_swap_page from handling page faults under VMA lock

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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.

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>

(cherry picked from commit 17c05f18e5)

Bug: 161210518
Change-Id: I047f4d0e0ca3b3bf9505e5cda2da768c88bed20e
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan
2023-02-27 09:36:25 -08:00
committed by Carlos Llamas
parent 318bf22529
commit 6e306e82ac
1 changed files with 5 additions and 0 deletions
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5
mm/memory.c
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@@ -3757,6 +3757,11 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
if (!pte_unmap_same(vmf))
goto out;
if (vmf->flags & FAULT_FLAG_VMA_LOCK) {
ret = VM_FAULT_RETRY;
goto out;
}
entry = pte_to_swp_entry(vmf->orig_pte);
if (unlikely(non_swap_entry(entry))) {
if (is_migration_entry(entry)) {