479 #define container_of_or_null(ptr, type, member)				\  argument
482 	_ptr ? container_of(_ptr, type, member) : NULL;			\
485 #define RB_INSERT(root, new, member, cmp)				\  argument
494 		this = container_of(*n, typeof(*(new)), member);	\
503 	rb_link_node(&(new)->member, parent, n);			\
504 	rb_insert_color(&(new)->member, root);				\
510 #define RB_SEARCH(root, search, member, cmp)				\  argument
517 		this = container_of(n, typeof(search), member);		\
530 #define RB_GREATER(root, search, member, cmp)				\  argument
537 		this = container_of(n, typeof(search), member);		\
548 #define RB_FIRST(root, type, member)					\  argument
549 	container_of_or_null(rb_first(root), type, member)
551 #define RB_LAST(root, type, member)					\  argument
552 	container_of_or_null(rb_last(root), type, member)
554 #define RB_NEXT(ptr, member)						\  argument
555 	container_of_or_null(rb_next(&(ptr)->member), typeof(*ptr), member)
557 #define RB_PREV(ptr, member)						\  argument
558 	container_of_or_null(rb_prev(&(ptr)->member), typeof(*ptr), member)