diff --git a/mm/mlock.c b/mm/mlock.c
index 048260c4e02ea7ced2692cc05fba67c9798c9145..7debb4fdf79b4ff4b536bfe5375acb1e7d56718a 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -549,7 +549,8 @@ SYSCALL_DEFINE1(mlockall, int, flags)
 	if (!can_do_mlock())
 		goto out;
 
-	lru_add_drain_all();	/* flush pagevec */
+	if (flags & MCL_CURRENT)
+		lru_add_drain_all();	/* flush pagevec */
 
 	down_write(&current->mm->mmap_sem);