--- old/src/share/vm/gc/parallel/cardTableExtension.hpp	2016-04-06 17:17:28.014383710 +0200
+++ new/src/share/vm/gc/parallel/cardTableExtension.hpp	2016-04-06 17:17:27.894383708 +0200
@@ -74,7 +74,7 @@
   bool addr_is_marked_imprecise(void *addr);
   bool addr_is_marked_precise(void *addr);
 
-  void set_card_newgen(void* addr)   { jbyte* p = byte_for(addr); *p = verify_card; }
+  void set_card_newgen(void* addr)   { volatile jbyte* p = byte_for(addr); *p = verify_card; }
 
   // Testers for entries
   static bool card_is_dirty(int value)      { return value == dirty_card; }
@@ -84,7 +84,7 @@
 
   // Card marking
   void inline_write_ref_field_gc(void* field, oop new_val) {
-    jbyte* byte = byte_for(field);
+    volatile jbyte* byte = byte_for(field);
     *byte = youngergen_card;
   }
 
@@ -103,7 +103,7 @@
 
 #ifdef ASSERT
 
-  bool is_valid_card_address(jbyte* addr) {
+  bool is_valid_card_address(volatile jbyte* addr) {
     return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);
   }