The quilt patch titled
Subject: mm: prevent do_swap_page from handling page faults under VMA lock
has been removed from the -mm tree. Its filename was
mm-prevent-do_swap_page-from-handling-page-faults-under-vma-lock.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: mm: prevent do_swap_page from handling page faults under VMA lock
Date: Mon, 27 Feb 2023 09:36:25 -0800
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@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Reviewed-by: Laurent Dufour <laurent.dufour@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/mm/memory.c~mm-prevent-do_swap_page-from-handling-page-faults-under-vma-lock
+++ a/mm/memory.c
@@ -3697,6 +3697,11 @@ vm_fault_t do_swap_page(struct vm_fault
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)) {
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
