--- old/src/hotspot/share/gc/z/zPhysicalMemory.hpp	2019-03-13 12:29:29.075366201 +0100
+++ new/src/hotspot/share/gc/z/zPhysicalMemory.hpp	2019-03-13 12:29:28.749355683 +0100
@@ -94,7 +94,9 @@
 
   void map(ZPhysicalMemory pmem, uintptr_t offset);
   void unmap(ZPhysicalMemory pmem, uintptr_t offset);
-  void flip(ZPhysicalMemory pmem, uintptr_t offset);
+
+  void debug_map(ZPhysicalMemory pmem, uintptr_t offset);
+  void debug_unmap(ZPhysicalMemory pmem, uintptr_t offset);
 };
 
 #endif // SHARE_GC_Z_ZPHYSICALMEMORY_HPP