kernel/sched/sched.h

992 struct balance_callback {
993 	struct balance_callback *next;
1090 	struct balance_callback *balance_callback;
1606 extern struct balance_callback balance_push_callback;
1626 	SCHED_WARN_ON(rq->balance_callback && rq->balance_callback != &balance_push_callback);
1806 		       struct balance_callback *head,
1816 	if (unlikely(head->next || rq->balance_callback == &balance_push_callback))
1820 	head->next = rq->balance_callback;
1821 	rq->balance_callback = head;