--- old/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp	2015-04-21 14:30:21.021122805 +0200
+++ new/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp	2015-04-21 14:30:20.955120894 +0200
@@ -25,6 +25,7 @@
 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
 
+#include "gc_implementation/g1/g1BlockOffsetTable.hpp"
 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
 #include "memory/cardTableModRefBS.hpp"
 #include "memory/memRegion.hpp"
@@ -153,6 +154,11 @@
     return ReservedSpace::allocation_align_size_up(number_of_slots);
   }
 
+  // Returns how many bytes of the heap a single byte of the Card Table corresponds to.
+  static size_t heap_map_factor() {
+    return G1BlockOffsetSharedArray::heap_map_factor();
+  }
+
   G1SATBCardTableLoggingModRefBS(MemRegion whole_heap);
 
   virtual void initialize() { }