526 static struct task_struct *find_child_reaper(struct task_struct *father,  in find_child_reaper()  argument
531 	struct pid_namespace *pid_ns = task_active_pid_ns(father);  in find_child_reaper()
535 	if (likely(reaper != father))  in find_child_reaper()
538 	reaper = find_alive_thread(father);  in find_child_reaper()
554 	return father;  in find_child_reaper()
564 static struct task_struct *find_new_reaper(struct task_struct *father,  in find_new_reaper()  argument
569 	thread = find_alive_thread(father);  in find_new_reaper()
573 	if (father->signal->has_child_subreaper) {  in find_new_reaper()
574 		unsigned int ns_level = task_pid(father)->level;  in find_new_reaper()
583 		for (reaper = father->real_parent;  in find_new_reaper()
602 static void reparent_leader(struct task_struct *father, struct task_struct *p,  in reparent_leader()  argument
620 	kill_orphaned_pgrp(p, father);  in reparent_leader()
631 static void forget_original_parent(struct task_struct *father,  in forget_original_parent()  argument
636 	if (unlikely(!list_empty(&father->ptraced)))  in forget_original_parent()
637 		exit_ptrace(father, dead);  in forget_original_parent()
640 	reaper = find_child_reaper(father, dead);  in forget_original_parent()
641 	if (list_empty(&father->children))  in forget_original_parent()
644 	reaper = find_new_reaper(father, reaper);  in forget_original_parent()
645 	list_for_each_entry(p, &father->children, sibling) {  in forget_original_parent()
648 			BUG_ON((!t->ptrace) != (rcu_access_pointer(t->parent) == father));  in forget_original_parent()
660 		if (!same_thread_group(reaper, father))  in forget_original_parent()
661 			reparent_leader(father, p, dead);  in forget_original_parent()
663 	list_splice_tail_init(&father->children, &reaper->children);  in forget_original_parent()