diff -r 90e004691873 -r af4d405aacc1 hotspot/src/share/vm/memory/genCollectedHeap.hpp
--- a/hotspot/src/share/vm/memory/genCollectedHeap.hpp	Tue Jan 12 14:56:46 2010 -0800
+++ b/hotspot/src/share/vm/memory/genCollectedHeap.hpp	Wed Jan 13 15:26:39 2010 -0800
@@ -260,6 +260,10 @@
     return true;
   }
 
+  virtual bool card_mark_must_follow_store() const {
+    return UseConcMarkSweepGC;
+  }
+
   // We don't need barriers for stores to objects in the
   // young gen and, a fortiori, for initializing stores to
   // objects therein. This applies to {DefNew,ParNew}+{Tenured,CMS}