diff -r 2c0751569716 -r c7a555a9449a src/share/vm/memory/cardTableRS.hpp
--- a/src/share/vm/memory/cardTableRS.hpp	Tue Mar 13 21:12:53 2012 +0100
+++ b/src/share/vm/memory/cardTableRS.hpp	Wed Mar 14 12:49:27 2012 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -45,6 +45,10 @@
     return CardTableModRefBS::clean_card;
   }
 
+  static intptr_t clean_card_row() {
+    return CardTableModRefBS::clean_card_row;
+  }
+
   static bool
   card_is_dirty_wrt_gen_iter(jbyte cv) {
     return CardTableModRefBS::card_is_dirty_wrt_gen_iter(cv);
@@ -176,6 +180,8 @@
   // Work methods called by the clear_card()
   inline bool clear_card_serial(jbyte* entry);
   inline bool clear_card_parallel(jbyte* entry);
+  // check alignment of pointer
+  bool is_word_aligned(jbyte* entry);
 
 public:
   ClearNoncleanCardWrapper(DirtyCardToOopClosure* dirty_card_closure, CardTableRS* ct);