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src/hotspot/cpu/s390/sharedRuntime_s390.cpp

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@@ -2153,22 +2153,21 @@
   {
     Label no_block, sync;
 
     save_native_result(masm, ret_type, workspace_slot_offset); // Make Z_R2 available as work reg.
 
-    if (os::is_MP()) {
       if (UseMembar) {
         // Force this write out before the read below.
         __ z_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(Z_thread, Z_R1, Z_R2);
       }
-    }
+
     __ safepoint_poll(sync, Z_R1);
 
     __ load_and_test_int(Z_R0, Address(Z_thread, JavaThread::suspend_flags_offset()));
     __ z_bre(no_block);
 
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