extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
extern void rt6_ifdown(struct net *net, struct net_device *dev);
-extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
+extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);