*** old/src/share/vm/gc/g1/g1CardCounts.cpp	Tue Mar  8 15:19:27 2016
--- new/src/share/vm/gc/g1/g1CardCounts.cpp	Tue Mar  8 15:19:27 2016

*** 144,156 ****
--- 144,155 ----
   public:
    G1CardCountsClearClosure(G1CardCounts* card_counts) :
      HeapRegionClosure(), _card_counts(card_counts) { }
  
  
!   virtual bool doHeapRegion(HeapRegion* r) {
!   virtual void doHeapRegion(HeapRegion* r) {
      _card_counts->clear_region(r);
      return false;
    }
  };
  
  void G1CardCounts::clear_all() {
    assert(SafepointSynchronize::is_at_safepoint(), "don't call this otherwise");