netdev_upper_get_next_dev_rcu
struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \
updev = netdev_upper_get_next_dev_rcu(dev, &(iter)))
EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);