small include/linux/list.h integration ...

diff -Nru linux-2.4.7.vanilla/include/linux/list.h linux-2.4.7/include/linux/list.h
@@ -149,6 +149,11 @@
 #define list_for_each(pos, head) \
        for (pos = (head)->next; pos != (head); pos = pos->next)
 
+#define list_first(head)       (((head)->next != (head)) ? (head)->next: (struct list_head *) 0)
+#define list_last(head)        (((head)->prev != (head)) ? (head)->prev: (struct list_head *) 0)
+#define list_next(pos, head)   (((pos)->next != (head)) ? (pos)->next: (struct list_head *) 0)
+#define list_prev(pos, head)   (((pos)->prev != (head)) ? (pos)->prev: (struct list_head *) 0)
+
 #endif /* __KERNEL__ || _LVM_H_INCLUDE */
 
 #endif