--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Thu Mar 03 09:31:46 2011 -0800
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Thu Mar 03 21:02:56 2011 -0800
@@ -5474,8 +5474,6 @@
   _refine_cte_cl->set_concurrent(concurrent);
 }
 
-#ifdef ASSERT
-
 bool G1CollectedHeap::is_in_closed_subset(const void* p) const {
   HeapRegion* hr = heap_region_containing(p);
   if (hr == NULL) {
@@ -5484,7 +5482,6 @@
     return hr->is_in(p);
   }
 }
-#endif // ASSERT
 
 class VerifyRegionListsClosure : public HeapRegionClosure {
 private:

--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Thu Mar 03 09:31:46 2011 -0800
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Thu Mar 03 21:02:56 2011 -0800
@@ -1134,7 +1134,7 @@
     return _g1_committed;
   }
 
-  NOT_PRODUCT(bool is_in_closed_subset(const void* p) const;)
+  virtual bool is_in_closed_subset(const void* p) const;
 
   // Dirty card table entries covering a list of young regions.
   void dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list);