22 	struct hlist_nulls_node *first;  member
30 	((ptr)->first = (struct hlist_nulls_node *) NULLS_MARKER(nulls))
31 #define HLIST_NULLS_HEAD_INIT(nulls) {.first = (struct hlist_nulls_node *)NULLS_MARKER(nulls)}
89 	return is_a_nulls(READ_ONCE(h->first));  in hlist_nulls_empty()
95 	struct hlist_nulls_node *first = h->first;  in hlist_nulls_add_head()  local
97 	n->next = first;  in hlist_nulls_add_head()
98 	WRITE_ONCE(n->pprev, &h->first);  in hlist_nulls_add_head()
99 	h->first = n;  in hlist_nulls_add_head()
100 	if (!is_a_nulls(first))  in hlist_nulls_add_head()
101 		WRITE_ONCE(first->pprev, &n->next);  in hlist_nulls_add_head()
129 	for (pos = (head)->first;					       \