47 #define list_entry(link, type, member) \  argument
48 	((type *)((char *)(link)-(unsigned long)(&((type *)0)->member)))
50 #define list_head(list, type, member)		\  argument
51 	list_entry((list)->next, type, member)
53 #define list_tail(list, type, member)		\  argument
54 	list_entry((list)->prev, type, member)
56 #define list_next(elm, member)					\  argument
57 	list_entry((elm)->member.next, typeof(*elm), member)
59 #define list_for_each_entry(pos, list, member)			\  argument
60 	for (pos = list_head(list, typeof(*pos), member);	\
61 	     &pos->member != (list);				\
62 	     pos = list_next(pos, member))