diff -r 6ffb8d7fe1e4 -r a421bdf22394 src/hotspot/share/runtime/mutexLocker.hpp
--- a/src/hotspot/share/runtime/mutexLocker.hpp	Tue Mar 05 14:07:30 2019 -0800
+++ b/src/hotspot/share/runtime/mutexLocker.hpp	Tue Mar 05 19:54:33 2019 -0500
@@ -78,10 +78,6 @@
 extern Monitor* FullGCCount_lock;                // in support of "concurrent" full gc
 extern Monitor* SATB_Q_CBL_mon;                  // Protects SATB Q
                                                  // completed buffer queue.
-extern Mutex*   Shared_SATB_Q_lock;              // Lock protecting SATB
-                                                 // queue shared by
-                                                 // non-Java threads.
-
 extern Monitor* DirtyCardQ_CBL_mon;              // Protects dirty card Q
                                                  // completed buffer queue.
 extern Mutex*   Shared_DirtyCardQ_lock;          // Lock protecting dirty card