--- a/src/hotspot/cpu/ppc/sharedRuntime_ppc.cpp	Wed Oct 03 11:43:39 2018 +0530
+++ b/src/hotspot/cpu/ppc/sharedRuntime_ppc.cpp	Wed Oct 03 03:41:57 2018 -0400
@@ -2430,17 +2430,15 @@
   {
     Label no_block, sync;
 
-    if (os::is_MP()) {
-      if (UseMembar) {
-        // Force this write out before the read below.
-        __ fence();
-      } else {
-        // Write serialization page so VM thread can do a pseudo remote membar.
-        // We use the current thread pointer to calculate a thread specific
-        // offset to write to within the page. This minimizes bus traffic
-        // due to cache line collision.
-        __ serialize_memory(R16_thread, r_temp_4, r_temp_5);
-      }
+    if (UseMembar) {
+      // Force this write out before the read below.
+      __ fence();
+    } else {
+      // Write serialization page so VM thread can do a pseudo remote membar.
+      // We use the current thread pointer to calculate a thread specific
+      // offset to write to within the page. This minimizes bus traffic
+      // due to cache line collision.
+      __ serialize_memory(R16_thread, r_temp_4, r_temp_5);
     }
 
     Register sync_state_addr = r_temp_4;