do_notify_parent
extern __must_check bool do_notify_parent(struct task_struct *, int);
if (do_notify_parent(p, p->exit_signal))
zap_leader = do_notify_parent(leader, leader->exit_signal);
if (do_notify_parent(p, p->exit_signal)) {
autoreap = do_notify_parent(tsk, sig);
do_notify_parent(tsk, tsk->exit_signal);
dead = do_notify_parent(p, p->exit_signal);