--- linux-2.6.8.1/include/linux/list.h	2004-08-14 19:55:33.000000000 +0900
+++ linux-2.6.8.1.rcu/include/linux/list.h	2004-08-20 18:04:10.000000000 +0900
@@ -194,8 +194,23 @@
 	__list_del(entry->prev, entry->next);
 	entry->prev = LIST_POISON2;
 }
 
+/*
+ * list_replace_rcu - replace old entry by new onw from list
+ * @old : the element to be replaced from the list.
+ * @new : the new element to insert to the list.
+ * 
+ * The old entry will be replaced to the new entry atomically.
+ */
+static inline void list_replace_rcu(struct list_head *old, struct list_head *new){
+	new->next = old->next;
+	new->prev = old->prev;
+	smp_wmb();
+	new->next->prev = new;
+	new->prev->next = new;
+}
+
 /**
  * list_del_init - deletes entry from list and reinitialize it.
  * @entry: the element to delete from the list.
  */