diff -r d3a33953b936 -r e64383344f14 src/hotspot/share/runtime/mutexLocker.hpp
--- a/src/hotspot/share/runtime/mutexLocker.hpp	Wed Jun 26 09:06:32 2019 -0400
+++ b/src/hotspot/share/runtime/mutexLocker.hpp	Wed Jun 26 13:18:38 2019 -0400
@@ -77,8 +77,6 @@
                                                  // fore- & background GC threads.
 extern Monitor* STS_lock;                        // used for joining/leaving SuspendibleThreadSet.
 extern Monitor* FullGCCount_lock;                // in support of "concurrent" full gc
-extern Monitor* SATB_Q_CBL_mon;                  // Protects SATB Q
-                                                 // completed buffer queue.
 extern Monitor* DirtyCardQ_CBL_mon;              // Protects dirty card Q
                                                  // completed buffer queue.
 extern Mutex*   Shared_DirtyCardQ_lock;          // Lock protecting dirty card