[IPV4]: Cleanup the sysctl_net_ipv4.c file

This includes several cleanups:

 * tune Makefile to compile out this file when SYSCTL=n. Now
   it looks like net/core/sysctl_net_core.c one;
 * move the ipv4_config to af_inet.c to exist all the time;
 * remove additional sysctl_ip_nonlocal_bind declaration
   (it is already declared in net/ip.h);
 * remove no nonger needed ifdefs from this file.

This is a preparation for using ctl paths for net/ipv4/
sysctl table.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/Makefile

@@ -10,9 +10,10 @@ obj-y     := route.o inetpeer.o protocol.o \
 	     tcp_minisocks.o tcp_cong.o \
 	     datagram.o raw.o udp.o udplite.o \
 	     arp.o icmp.o devinet.o af_inet.o  igmp.o \
-	     sysctl_net_ipv4.o fib_frontend.o fib_semantics.o \
+	     fib_frontend.o fib_semantics.o \
 	     inet_fragment.o
 
+obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
 obj-$(CONFIG_IP_FIB_HASH) += fib_hash.o
 obj-$(CONFIG_IP_FIB_TRIE) += fib_trie.o
 obj-$(CONFIG_PROC_FS) += proc.o

net/ipv4/af_inet.c

@@ -126,6 +126,10 @@ extern void ip_mc_drop_socket(struct sock *sk);
 static struct list_head inetsw[SOCK_MAX];
 static DEFINE_SPINLOCK(inetsw_lock);
 
+struct ipv4_config ipv4_config;
+
+EXPORT_SYMBOL(ipv4_config);
+
 /* New destruction routine */
 
 void inet_sock_destruct(struct sock *sk)

net/ipv4/sysctl_net_ipv4.c

@@ -21,19 +21,10 @@
 #include <net/cipso_ipv4.h>
 #include <net/inet_frag.h>
 
-/* From af_inet.c */
-extern int sysctl_ip_nonlocal_bind;
-
-#ifdef CONFIG_SYSCTL
 static int zero;
 static int tcp_retr1_max = 255;
 static int ip_local_port_range_min[] = { 1, 1 };
 static int ip_local_port_range_max[] = { 65535, 65535 };
-#endif
-
-struct ipv4_config ipv4_config;
-
-#ifdef CONFIG_SYSCTL
 
 static
 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
@@ -887,7 +878,3 @@ ctl_table ipv4_table[] = {
 	},
 	{ .ctl_name = 0 }
 };
-
-#endif /* CONFIG_SYSCTL */
-
-EXPORT_SYMBOL(ipv4_config);