delayed_work_timer_fn
.timer = __TIMER_INITIALIZER(delayed_work_timer_fn,\
delayed_work_timer_fn, \
delayed_work_timer_fn, \
void delayed_work_timer_fn(struct timer_list *t);
TIMER_HINT(delayed_work_timer_fn,
EXPORT_SYMBOL(delayed_work_timer_fn);
WARN_ON_ONCE(timer->function != delayed_work_timer_fn);