--- old/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2014-02-13 17:47:59.557769885 +0100
+++ new/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2014-02-13 17:47:59.349769891 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -844,10 +844,12 @@
   // list later). The used bytes of freed regions are accumulated in
   // pre_used. If par is true, the region's RSet will not be freed
   // up. The assumption is that this will be done later.
+  // The locked parameter indicates if the caller has already taken
+  // care of proper synchronization. This may allow some optimizations.
   void free_region(HeapRegion* hr,
                    size_t* pre_used,
                    FreeRegionList* free_list,
-                   bool par);
+                   bool par, bool locked = false);
 
   // Frees a humongous region by collapsing it into individual regions
   // and calling free_region() for each of them. The freed regions