update_tsk_timer
user = update_tsk_timer(&tsk->thread.user_timer, lc->user_timer);
guest = update_tsk_timer(&tsk->thread.guest_timer, lc->guest_timer);
system = update_tsk_timer(&tsk->thread.system_timer, lc->system_timer);
hardirq = update_tsk_timer(&tsk->thread.hardirq_timer, lc->hardirq_timer);
softirq = update_tsk_timer(&tsk->thread.softirq_timer, lc->softirq_timer);