--- old/src/share/vm/gc/shared/cardTableRS.hpp	2016-04-06 17:17:35.606383799 +0200
+++ new/src/share/vm/gc/shared/cardTableRS.hpp	2016-04-06 17:17:35.498383798 +0200
@@ -89,7 +89,7 @@
   // used as the current value for a younger_refs_do iteration of that
   // portion of the table. The perm gen is index 0. The young gen is index 1,
   // but will always have the value "clean_card". The old gen is index 2.
-  jbyte* _last_cur_val_in_gen;
+  volatile jbyte* _last_cur_val_in_gen;
 
   jbyte _cur_youngergen_card_val;
 
@@ -136,7 +136,7 @@
   void younger_refs_iterate(Generation* g, OopsInGenClosure* blk, uint n_threads);
 
   void inline_write_ref_field_gc(void* field, oop new_val) {
-    jbyte* byte = _ct_bs->byte_for(field);
+    volatile jbyte* byte = _ct_bs->byte_for(field);
     *byte = youngergen_card;
   }
   void write_ref_field_gc_work(void* field, oop new_val) {
@@ -168,9 +168,9 @@
     return CardTableModRefBSForCTRS::ct_max_alignment_constraint();
   }
 
-  jbyte* byte_for(void* p)     { return _ct_bs->byte_for(p); }
-  jbyte* byte_after(void* p)   { return _ct_bs->byte_after(p); }
-  HeapWord* addr_for(jbyte* p) { return _ct_bs->addr_for(p); }
+  volatile jbyte* byte_for(void* p)     { return _ct_bs->byte_for(p); }
+  volatile jbyte* byte_after(void* p)   { return _ct_bs->byte_after(p); }
+  HeapWord* addr_for(volatile jbyte* p) { return _ct_bs->addr_for(p); }
 
   bool is_prev_nonclean_card_val(jbyte v) {
     return
@@ -192,12 +192,12 @@
 private:
   // Clears the given card, return true if the corresponding card should be
   // processed.
-  inline bool clear_card(jbyte* entry);
+  inline bool clear_card(volatile jbyte* entry);
   // Work methods called by the clear_card()
-  inline bool clear_card_serial(jbyte* entry);
-  inline bool clear_card_parallel(jbyte* entry);
+  inline bool clear_card_serial(volatile jbyte* entry);
+  inline bool clear_card_parallel(volatile jbyte* entry);
   // check alignment of pointer
-  bool is_word_aligned(jbyte* entry);
+  bool is_word_aligned(volatile jbyte* entry);
 
 public:
   ClearNoncleanCardWrapper(DirtyCardToOopClosure* dirty_card_closure, CardTableRS* ct, bool is_par);