net: snmp: kill various STATS_USER() helpers

In the old days (before linux-3.0), SNMP counters were duplicated,
one for user context, and one for BH context.

After commit 8f0ea0fe3a03 ("snmp: reduce percpu needs by 50%")
we have a single copy, and what really matters is preemption being
enabled or disabled, since we use this_cpu_inc() or __this_cpu_inc()
respectively.

We therefore kill SNMP_INC_STATS_USER(), SNMP_ADD_STATS_USER(),
NET_INC_STATS_USER(), NET_ADD_STATS_USER(), SCTP_INC_STATS_USER(),
SNMP_INC_STATS64_USER(), SNMP_ADD_STATS64_USER(), TCP_ADD_STATS_USER(),
UDP_INC_STATS_USER(), UDP6_INC_STATS_USER(), and XFRM_INC_STATS_USER()

Following patches will rename __BH helpers to make clear their
usage is not tied to BH being disabled.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 8d8b2cd..baa56ca 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -423,24 +423,22 @@
 		if (!peeked) {
 			atomic_inc(&sk->sk_drops);
 			if (is_udp4)
-				UDP_INC_STATS_USER(sock_net(sk),
-						   UDP_MIB_INERRORS,
-						   is_udplite);
+				UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
+					      is_udplite);
 			else
-				UDP6_INC_STATS_USER(sock_net(sk),
-						    UDP_MIB_INERRORS,
-						    is_udplite);
+				UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
+					       is_udplite);
 		}
 		skb_free_datagram_locked(sk, skb);
 		return err;
 	}
 	if (!peeked) {
 		if (is_udp4)
-			UDP_INC_STATS_USER(sock_net(sk),
-					UDP_MIB_INDATAGRAMS, is_udplite);
+			UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
+				      is_udplite);
 		else
-			UDP6_INC_STATS_USER(sock_net(sk),
-					UDP_MIB_INDATAGRAMS, is_udplite);
+			UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
+				       is_udplite);
 	}
 
 	sock_recv_ts_and_drops(msg, sk, skb);
@@ -487,15 +485,15 @@
 	slow = lock_sock_fast(sk);
 	if (!skb_kill_datagram(sk, skb, flags)) {
 		if (is_udp4) {
-			UDP_INC_STATS_USER(sock_net(sk),
-					UDP_MIB_CSUMERRORS, is_udplite);
-			UDP_INC_STATS_USER(sock_net(sk),
-					UDP_MIB_INERRORS, is_udplite);
+			UDP_INC_STATS(sock_net(sk),
+				      UDP_MIB_CSUMERRORS, is_udplite);
+			UDP_INC_STATS(sock_net(sk),
+				      UDP_MIB_INERRORS, is_udplite);
 		} else {
-			UDP6_INC_STATS_USER(sock_net(sk),
-					UDP_MIB_CSUMERRORS, is_udplite);
-			UDP6_INC_STATS_USER(sock_net(sk),
-					UDP_MIB_INERRORS, is_udplite);
+			UDP6_INC_STATS(sock_net(sk),
+				       UDP_MIB_CSUMERRORS, is_udplite);
+			UDP6_INC_STATS(sock_net(sk),
+				       UDP_MIB_INERRORS, is_udplite);
 		}
 	}
 	unlock_sock_fast(sk, slow);
@@ -1015,13 +1013,14 @@
 	err = ip6_send_skb(skb);
 	if (err) {
 		if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
-			UDP6_INC_STATS_USER(sock_net(sk),
-					    UDP_MIB_SNDBUFERRORS, is_udplite);
+			UDP6_INC_STATS(sock_net(sk),
+				       UDP_MIB_SNDBUFERRORS, is_udplite);
 			err = 0;
 		}
-	} else
-		UDP6_INC_STATS_USER(sock_net(sk),
-				    UDP_MIB_OUTDATAGRAMS, is_udplite);
+	} else {
+		UDP6_INC_STATS(sock_net(sk),
+			       UDP_MIB_OUTDATAGRAMS, is_udplite);
+	}
 	return err;
 }
 
@@ -1342,8 +1341,8 @@
 	 * seems like overkill.
 	 */
 	if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
-		UDP6_INC_STATS_USER(sock_net(sk),
-				UDP_MIB_SNDBUFERRORS, is_udplite);
+		UDP6_INC_STATS(sock_net(sk),
+			       UDP_MIB_SNDBUFERRORS, is_udplite);
 	}
 	return err;