501 static struct task_struct *find_child_reaper(struct task_struct *father,  in find_child_reaper()  argument
506 	struct pid_namespace *pid_ns = task_active_pid_ns(father);  in find_child_reaper()
510 	if (likely(reaper != father))  in find_child_reaper()
513 	reaper = find_alive_thread(father);  in find_child_reaper()
522 			father->signal->group_exit_code ?: father->exit_code);  in find_child_reaper()
533 	return father;  in find_child_reaper()
543 static struct task_struct *find_new_reaper(struct task_struct *father,  in find_new_reaper()  argument
548 	thread = find_alive_thread(father);  in find_new_reaper()
552 	if (father->signal->has_child_subreaper) {  in find_new_reaper()
553 		unsigned int ns_level = task_pid(father)->level;  in find_new_reaper()
562 		for (reaper = father->real_parent;  in find_new_reaper()
581 static void reparent_leader(struct task_struct *father, struct task_struct *p,  in reparent_leader()  argument
599 	kill_orphaned_pgrp(p, father);  in reparent_leader()
610 static void forget_original_parent(struct task_struct *father,  in forget_original_parent()  argument
615 	if (unlikely(!list_empty(&father->ptraced)))  in forget_original_parent()
616 		exit_ptrace(father, dead);  in forget_original_parent()
619 	reaper = find_child_reaper(father, dead);  in forget_original_parent()
620 	if (list_empty(&father->children))  in forget_original_parent()
623 	reaper = find_new_reaper(father, reaper);  in forget_original_parent()
624 	list_for_each_entry(p, &father->children, sibling) {  in forget_original_parent()
627 			BUG_ON((!t->ptrace) != (t->parent == father));  in forget_original_parent()
639 		if (!same_thread_group(reaper, father))  in forget_original_parent()
640 			reparent_leader(father, p, dead);  in forget_original_parent()
642 	list_splice_tail_init(&father->children, &reaper->children);  in forget_original_parent()