--- a/src/hotspot/share/gc/z/zPhysicalMemory.hpp	Sun Mar 17 08:26:38 2019 +0000
+++ b/src/hotspot/share/gc/z/zPhysicalMemory.hpp	Mon Mar 18 11:50:38 2019 +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