[NET]: prot_inuse cleanups and optimizations

1) Cleanups (all functions are prefixed by sock_prot_inuse)

sock_prot_inc_use(prot) -> sock_prot_inuse_add(prot,-1)
sock_prot_dec_use(prot) -> sock_prot_inuse_add(prot,-1)
sock_prot_inuse()       -> sock_prot_inuse_get()

New functions :

sock_prot_inuse_init() and sock_prot_inuse_free() to abstract pcounter use.

2) if CONFIG_PROC_FS=n, we can zap 'inuse' member from "struct proto",
since nobody wants to read the inuse value.

This saves 1372 bytes on i386/SMP and some cpu cycles.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 20fece4ad3d..bf2a686aa13 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -268,8 +268,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                                 struct inet_connection_sock *icsk = inet_csk(sk);
 
                                 local_bh_disable();
-                                sock_prot_dec_use(sk->sk_prot);
-                                sock_prot_inc_use(&tcp_prot);
+                                sock_prot_inuse_add(sk->sk_prot, -1);
+                                sock_prot_inuse_add(&tcp_prot, 1);
                                 local_bh_enable();
                                 sk->sk_prot = &tcp_prot;
                                 icsk->icsk_af_ops = &ipv4_specific;
@@ -282,8 +282,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
                                         prot = &udplite_prot;
                                 local_bh_disable();
-                                sock_prot_dec_use(sk->sk_prot);
-                                sock_prot_inc_use(prot);
+                                sock_prot_inuse_add(sk->sk_prot, -1);
+                                sock_prot_inuse_add(prot, 1);
                                 local_bh_enable();
                                 sk->sk_prot = prot;
                                 sk->sk_socket->ops = &inet_dgram_ops;