--- old/src/hotspot/share/runtime/stubRoutines.hpp	2018-07-19 11:58:52.189285210 +0100
+++ new/src/hotspot/share/runtime/stubRoutines.hpp	2018-07-19 11:58:51.911284373 +0100
@@ -151,6 +151,10 @@
   static address _arrayof_jlong_disjoint_arraycopy;
   static address _arrayof_oop_disjoint_arraycopy, _arrayof_oop_disjoint_arraycopy_uninit;
 
+  // cache line writeback
+  static address _data_cache_writeback;
+  static address _data_cache_writeback_sync;
+
   // these are recommended but optional:
   static address _checkcast_arraycopy, _checkcast_arraycopy_uninit;
   static address _unsafe_arraycopy;
@@ -329,6 +333,9 @@
     return dest_uninitialized ? _arrayof_oop_disjoint_arraycopy_uninit : _arrayof_oop_disjoint_arraycopy;
   }
 
+  static address data_cache_writeback() { return _data_cache_writeback; }
+  static address data_cache_writeback_sync() { return _data_cache_writeback_sync; }
+
   static address checkcast_arraycopy(bool dest_uninitialized = false) {
     return dest_uninitialized ? _checkcast_arraycopy_uninit : _checkcast_arraycopy;
   }