1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/futex.c b/kernel/futex.c
index 815d7af2ffe8..f3a3a071283c 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -343,6 +343,8 @@ static void get_futex_key_refs(union futex_key *key)
         case FUT_OFF_MMSHARED:
                 futex_get_mm(key); /* implies MB (B) */
                 break;
+        default:
+                smp_mb(); /* explicit MB (B) */
         }
 }