list: add list_for_each_entry_reverse macro

Signed-off-by: Jiri Pirko <jiri@mellanox.com>

include/list.h

@@ -50,9 +50,15 @@ static inline void list_del(struct list_head *entry)
 #define list_first_entry(ptr, type, member) \
 	list_entry((ptr)->next, type, member)
 
+#define list_last_entry(ptr, type, member) \
+	list_entry((ptr)->prev, type, member)
+
 #define list_next_entry(pos, member) \
 	list_entry((pos)->member.next, typeof(*(pos)), member)
 
+#define list_prev_entry(pos, member) \
+	list_entry((pos)->member.prev, typeof(*(pos)), member)
+
 #define list_for_each_entry(pos, head, member)				\
 	for (pos = list_first_entry(head, typeof(*pos), member);	\
 	     &pos->member != (head);					\
@@ -64,6 +70,11 @@ static inline void list_del(struct list_head *entry)
 	     &pos->member != (head);					\
 	     pos = n, n = list_next_entry(n, member))
 
+#define list_for_each_entry_reverse(pos, head, member)			\
+	for (pos = list_last_entry(head, typeof(*pos), member);		\
+	     &pos->member != (head);					\
+	     pos = list_prev_entry(pos, member))
+
 struct hlist_head {
 	struct hlist_node *first;
 };