static bool v4l2_is_known_ioctl(unsigned int cmd)
{
	if (_IOC_NR(cmd) >= V4L2_IOCTLS)
		return false;
	return v4l2_ioctls[_IOC_NR(cmd)].ioctl == cmd;
}
static bool v4l2_is_known_ioctl(unsigned int cmd)
{
	if (_IOC_NR(cmd) >= V4L2_IOCTLS)
		return false;
	return v4l2_ioctls[_IOC_NR(cmd)].ioctl == cmd;
}