static void tty_update_time(struct timespec64 *time)
{
	time64_t sec = ktime_get_real_seconds();

	/*
	 * We only care if the two values differ in anything other than the
	 * lower three bits (i.e every 8 seconds).  If so, then we can update
	 * the time of the tty device, otherwise it could be construded as a
	 * security leak to let userspace know the exact timing of the tty.
	 */
	if ((sec ^ time->tv_sec) & ~7)
		time->tv_sec = sec;
}
static void tty_update_time(struct timespec64 *time)
{
	time64_t sec = ktime_get_real_seconds();

	 
	if ((sec ^ time->tv_sec) & ~7)
		time->tv_sec = sec;
}