--- old/src/hotspot/share/gc/shared/ptrQueue.cpp	2018-11-20 17:32:08.885217373 -0500
+++ new/src/hotspot/share/gc/shared/ptrQueue.cpp	2018-11-20 17:32:08.413191913 -0500
@@ -74,12 +74,6 @@
   _buf[index()] = ptr;
 }
 
-void PtrQueue::locking_enqueue_completed_buffer(BufferNode* node) {
-  assert(_lock->owned_by_self(), "Required.");
-  qset()->enqueue_complete_buffer(node);
-}
-
-
 BufferNode* BufferNode::allocate(size_t size) {
   size_t byte_size = size * sizeof(void*);
   void* data = NEW_C_HEAP_ARRAY(char, buffer_offset() + byte_size, mtGC);
@@ -222,7 +216,7 @@
       BufferNode* node = BufferNode::make_node_from_buffer(_buf, index());
       _buf = NULL;         // clear shared _buf field
 
-      locking_enqueue_completed_buffer(node); // enqueue completed buffer
+      qset()->enqueue_complete_buffer(node);
       assert(_buf == NULL, "multiple enqueuers appear to be racing");
     } else {
       BufferNode* node = BufferNode::make_node_from_buffer(_buf, index());