CPU1							CPU2
	raw_spin_lock_irqsave(&p->pi_lock, flags);		set_task_state(tsk, TASK_INTERRUPTIBLE);
	if (!(p->state & state)) ---> TASK_INTERRUPTIBLE			 |
                goto out;							 |
	cpu = task_cpu(p);					set_task_state(tsk, TASK_RUNNING);
			... ---> TASK_RUNNING