static const void *device_namespace(struct kobject *kobj)
{
	struct device *dev = kobj_to_dev(kobj);
	const void *ns = NULL;

	if (dev->class && dev->class->ns_type)
		ns = dev->class->namespace(dev);

	return ns;
}
static const void *device_namespace(struct kobject *kobj)
{
	struct device *dev = kobj_to_dev(kobj);
	const void *ns = NULL;

	if (dev->class && dev->class->ns_type)
		ns = dev->class->namespace(dev);

	return ns;
}