--- a/src/hotspot/cpu/x86/sharedRuntime_x86_64.cpp	Thu Nov 08 11:22:28 2018 -0800
+++ b/src/hotspot/cpu/x86/sharedRuntime_x86_64.cpp	Thu Nov 08 11:45:13 2018 -0800
@@ -2560,18 +2560,10 @@
   //     didn't see any synchronization is progress, and escapes.
   __ movl(Address(r15_thread, JavaThread::thread_state_offset()), _thread_in_native_trans);
 
-  if (UseMembar) {
-    // Force this write out before the read below
-    __ membar(Assembler::Membar_mask_bits(
-                Assembler::LoadLoad | Assembler::LoadStore |
-                Assembler::StoreLoad | Assembler::StoreStore));
-  } 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(r15_thread, rcx);
-  }
+  // Force this write out before the read below
+  __ membar(Assembler::Membar_mask_bits(
+              Assembler::LoadLoad | Assembler::LoadStore |
+              Assembler::StoreLoad | Assembler::StoreStore));
 
   Label after_transition;