diff -r cbe83e9c2100 -r f1bb77833b59 src/hotspot/cpu/s390/globals_s390.hpp
--- a/src/hotspot/cpu/s390/globals_s390.hpp	Thu Nov 08 11:22:28 2018 -0800
+++ b/src/hotspot/cpu/s390/globals_s390.hpp	Thu Nov 08 11:45:13 2018 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2017 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2016, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -71,8 +71,6 @@
 define_pd_global(bool, RewriteBytecodes,     true);
 define_pd_global(bool, RewriteFrequentPairs, true);
 
-define_pd_global(bool, UseMembar,            true);
-
 define_pd_global(bool, PreserveFramePointer, false);
 
 // GC Ergo Flags