u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval)
{
	u64 overrun = 1;
	ktime_t delta;

	delta = ktime_sub(now, alarm->node.expires);

	if (delta < 0)
		return 0;

	if (unlikely(delta >= interval)) {
		s64 incr = ktime_to_ns(interval);

		overrun = ktime_divns(delta, incr);

		alarm->node.expires = ktime_add_ns(alarm->node.expires,
							incr*overrun);

		if (alarm->node.expires > now)
			return overrun;
		/*
		 * This (and the ktime_add() below) is the
		 * correction for exact:
		 */
		overrun++;
	}

	alarm->node.expires = ktime_add_safe(alarm->node.expires, interval);
	return overrun;
}
Unknown