1 files changed, 4 insertions, 4 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index 666e4e677414..14d0a6a632f6 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -120,10 +120,10 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
 
                 ptep = pte_offset_map(pmd, addr);
 
-                if (!is_swap_pte(*ptep)) {
-                        pte_unmap(ptep);
-                        goto out;
-                }
+                /*
+                 * Peek to check is_swap_pte() before taking ptlock?  No, we
+                 * can race mremap's move_ptes(), which skips anon_vma lock.
+                 */
 
                 ptl = pte_lockptr(mm, pmd);
         }