[NET]: Small cleanup to socket initialization

sock_init can be done as a core_initcall instead of calling
it directly in init/main.c

Also I removed an out of date #ifdef.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/skbuff.h

@@ -32,7 +32,6 @@
 
 #define HAVE_ALLOC_SKB		/* For the drivers to know */
 #define HAVE_ALIGNABLE_SKB	/* Ditto 8)		   */
-#define SLAB_SKB 		/* Slabified skbuffs 	   */
 
 #define CHECKSUM_NONE 0
 #define CHECKSUM_HW 1

include/linux/socket.h

@@ -27,7 +27,6 @@ struct __kernel_sockaddr_storage {
 #include <linux/compiler.h>		/* __user			*/
 
 extern int sysctl_somaxconn;
-extern void sock_init(void);
 #ifdef CONFIG_PROC_FS
 struct seq_file;
 extern void socket_seq_show(struct seq_file *seq);

init/main.c

@@ -47,7 +47,6 @@
 #include <linux/rmap.h>
 #include <linux/mempolicy.h>
 #include <linux/key.h>
-#include <net/sock.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -614,9 +613,6 @@ static void __init do_basic_setup(void)
 	sysctl_init();
 #endif
 
-	/* Networking initialization needs a process context */ 
-	sock_init();
-
 	do_initcalls();
 }
 

net/socket.c

@@ -2036,20 +2036,18 @@ int sock_unregister(int family)
 	return 0;
 }
 
-void __init sock_init(void)
+static int __init sock_init(void)
 {
 	/*
 	 *	Initialize sock SLAB cache.
 	 */
 
 	sk_init();
 
-#ifdef SLAB_SKB
 	/*
 	 *	Initialize skbuff SLAB cache 
 	 */
 	skb_init();
-#endif
 
 	/*
 	 *	Initialize the protocols module. 
@@ -2058,15 +2056,17 @@ void __init sock_init(void)
 	init_inodecache();
 	register_filesystem(&sock_fs_type);
 	sock_mnt = kern_mount(&sock_fs_type);
-	/* The real protocol initialization is performed when
-	 *  do_initcalls is run.  
+
+	/* The real protocol initialization is performed in later initcalls.
 	 */
 
 #ifdef CONFIG_NETFILTER
 	netfilter_init();
 #endif
 }
 
+core_initcall(sock_init);	/* early initcall */
+
 #ifdef CONFIG_PROC_FS
 void socket_seq_show(struct seq_file *seq)
 {