--- a/src/hotspot/share/runtime/os.hpp	Tue Aug 20 10:46:23 2019 +0200
+++ b/src/hotspot/share/runtime/os.hpp	Tue Aug 20 10:11:53 2019 +0100
@@ -823,6 +823,9 @@
 
   static char** split_path(const char* path, int* n);
 
+  // support for mapping non-volatile memory using MAP_SYNC
+  static bool supports_map_sync();
+
   // Extensions
 #include "runtime/os_ext.hpp"