--- old/src/share/vm/gc_implementation/parNew/parNewGeneration.hpp	2014-12-08 11:28:42.146095301 +0100
+++ new/src/share/vm/gc_implementation/parNew/parNewGeneration.hpp	2014-12-08 11:28:42.046098653 +0100
@@ -414,8 +414,8 @@
     return _plab_stats.desired_plab_sz();
   }
 
-  ParNewTracer& gc_tracer() {
-    return _gc_tracer;
+  const ParNewTracer* gc_tracer() const {
+    return &_gc_tracer;
   }
 
   static oop real_forwardee(oop obj);