net: Kill NETEVENT_PMTU_UPDATE.

Nobody actually does anything in response to the event,
so just kill it off.
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/cxgb3/cxgb3_offload.c

@@ -967,8 +967,6 @@ static int nb_callback(struct notifier_block *self, unsigned long event,
 		cxgb_neigh_update((struct neighbour *)ctx);
 		break;
 	}
-	case (NETEVENT_PMTU_UPDATE):
-		break;
 	case (NETEVENT_REDIRECT):{
 		struct netevent_redirect *nr = ctx;
 		cxgb_redirect(nr->old, nr->new);

drivers/net/cxgb4/cxgb4_main.c

@@ -2471,7 +2471,6 @@ static int netevent_cb(struct notifier_block *nb, unsigned long event,
 	case NETEVENT_NEIGH_UPDATE:
 		check_neigh_update(data);
 		break;
-	case NETEVENT_PMTU_UPDATE:
 	case NETEVENT_REDIRECT:
 	default:
 		break;

include/net/netevent.h

@@ -21,7 +21,6 @@ struct netevent_redirect {
 
 enum netevent_notif_type {
 	NETEVENT_NEIGH_UPDATE = 1, /* arg is struct neighbour ptr */
-	NETEVENT_PMTU_UPDATE,	   /* arg is struct dst_entry ptr */
 	NETEVENT_REDIRECT,	   /* arg is struct netevent_redirect ptr */
 };
 

net/ipv4/route.c

@@ -1762,7 +1762,6 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
 		}
 		dst_metric_set(dst, RTAX_MTU, mtu);
 		dst_set_expires(dst, ip_rt_mtu_expires);
-		call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
 	}
 }
 

net/ipv6/route.c

@@ -965,7 +965,6 @@ static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
 			dst_metric_set(dst, RTAX_FEATURES, features);
 		}
 		dst_metric_set(dst, RTAX_MTU, mtu);
-		call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
 	}
 }