__wake_up_parent
__wake_up_parent(leader, leader->parent);
extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
__wake_up_parent(p, tracer);
__wake_up_parent(tsk, tsk->parent);
__wake_up_parent(tsk, parent);
__wake_up_parent(current, unrcu_pointer(current->real_parent));