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@xxxxxxxxxx>
---
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;
--
2.37.2.789.g6183377224-goog
