--- old/src/hotspot/share/runtime/mutexLocker.hpp	2018-03-23 07:53:31.388135630 -0400
+++ new/src/hotspot/share/runtime/mutexLocker.hpp	2018-03-23 07:53:30.648067180 -0400
@@ -137,6 +137,9 @@
 extern Mutex*   UnsafeJlong_lock;                // provides Unsafe atomic updates to jlongs on platforms that don't support cx8
 #endif
 
+extern Mutex*   MetaspaceExpand_lock;            // protects Metaspace virtualspace and chunk expansions
+
+
 // A MutexLocker provides mutual exclusion with respect to a given mutex
 // for the scope which contains the locker.  The lock is an OS lock, not
 // an object lock, and the two do not interoperate.  Do not use Mutex-based