static inline long __sched
__wait_for_common(struct completion *x,
long (*action)(long), long timeout, int state)
{
might_sleep();
spin_lock_irq(&x->wait.lock);
timeout = do_wait_for_common(x, action, timeout, state);
spin_unlock_irq(&x->wait.lock);
return timeout;
}
// ARM10C 20170830
// x: &kthreadd_done, schedule_timeout, timeout: 0x7FFFFFFF, state: 2
static inline long __sched
__wait_for_common(struct completion *x,
long (*action)(long), long timeout, int state)
{
might_sleep(); // null function
// &x->wait.lock: &(&kthreadd_done)->wait.lock
spin_lock_irq(&x->wait.lock);
// spin_lock_irq 에서 한일:
// &(&kthreadd_done)->wait.lock 을 사용하여 spin lock 수행
// x: &kthreadd_done, action: schedule_timeout, timeout: 0x7FFFFFFF, state: 2
timeout = do_wait_for_common(x, action, timeout, state);
spin_unlock_irq(&x->wait.lock);
return timeout;
}
