[AF_PACKET]: Kill bogus CONFIG_PACKET_MULTICAST

It is unconditionally set by af_packet.c, not by the Kconfig
subsystem, so just kill it off.
Signed-off-by: David S. Miller <davem@davemloft.net>

net/packet/af_packet.c

@@ -85,20 +85,6 @@
 
 #define CONFIG_SOCK_PACKET	1
 
-/*
-   Proposed replacement for SIOC{ADD,DEL}MULTI and
-   IFF_PROMISC, IFF_ALLMULTI flags.
-
-   It is more expensive, but I believe,
-   it is really correct solution: reentereble, safe and fault tolerant.
-
-   IFF_PROMISC/IFF_ALLMULTI/SIOC{ADD/DEL}MULTI are faked by keeping
-   reference count and global flag, so that real status is
-   (gflag|(count != 0)), so that we can use obsolete faulty interface
-   not harming clever users.
- */
-#define CONFIG_PACKET_MULTICAST	1
-
 /*
    Assumptions:
    - if device has no dev->hard_header routine, it adds and removes ll header
@@ -159,7 +145,6 @@ static atomic_t packet_socks_nr;
 
 /* Private packet socket structures. */
 
-#ifdef CONFIG_PACKET_MULTICAST
 struct packet_mclist
 {
 	struct packet_mclist	*next;
@@ -179,7 +164,7 @@ struct packet_mreq_max
 	unsigned short	mr_alen;
 	unsigned char	mr_address[MAX_ADDR_LEN];
 };
-#endif
+
 #ifdef CONFIG_PACKET_MMAP
 static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing);
 #endif
@@ -205,9 +190,7 @@ struct packet_sock {
 				origdev:1;
 	int			ifindex;	/* bound device		*/
 	__be16			num;
-#ifdef CONFIG_PACKET_MULTICAST
 	struct packet_mclist	*mclist;
-#endif
 #ifdef CONFIG_PACKET_MMAP
 	atomic_t		mapped;
 	unsigned int            pg_vec_order;
@@ -851,9 +834,7 @@ static int packet_release(struct socket *sock)
 		__sock_put(sk);
 	}
 
-#ifdef CONFIG_PACKET_MULTICAST
 	packet_flush_mclist(sk);
-#endif
 
 #ifdef CONFIG_PACKET_MMAP
 	if (po->pg_vec) {
@@ -1221,7 +1202,6 @@ static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
 	return 0;
 }
 
-#ifdef CONFIG_PACKET_MULTICAST
 static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what)
 {
 	switch (i->type) {
@@ -1349,7 +1329,6 @@ static void packet_flush_mclist(struct sock *sk)
 	}
 	rtnl_unlock();
 }
-#endif
 
 static int
 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
@@ -1362,7 +1341,6 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 		return -ENOPROTOOPT;
 
 	switch(optname)	{
-#ifdef CONFIG_PACKET_MULTICAST
 	case PACKET_ADD_MEMBERSHIP:
 	case PACKET_DROP_MEMBERSHIP:
 	{
@@ -1383,7 +1361,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
 			ret = packet_mc_drop(sk, &mreq);
 		return ret;
 	}
-#endif
+
 #ifdef CONFIG_PACKET_MMAP
 	case PACKET_RX_RING:
 	{
@@ -1506,11 +1484,10 @@ static int packet_notifier(struct notifier_block *this, unsigned long msg, void
 
 		switch (msg) {
 		case NETDEV_UNREGISTER:
-#ifdef CONFIG_PACKET_MULTICAST
 			if (po->mclist)
 				packet_dev_mclist(dev, po->mclist, -1);
-			// fallthrough
-#endif
+			/* fallthrough */
+
 		case NETDEV_DOWN:
 			if (dev->ifindex == po->ifindex) {
 				spin_lock(&po->bind_lock);