static int param_set_scroll_speed(const char *val, struct kernel_param *kp) {
	unsigned long speed;
	if (!val || kstrtoul(val, 0, &speed) || speed > 63)
		return -EINVAL;
	scroll_speed = speed;
	return 0;
}
static int param_set_scroll_speed(const char *val, struct kernel_param *kp) {
	unsigned long speed;
	if (!val || kstrtoul(val, 0, &speed) || speed > 63)
		return -EINVAL;
	scroll_speed = speed;
	return 0;
}