[NET]: Don't declare extern variables in net/core/sysctl_net_core.c

Some are already declared in include/linux/netdevice.h, while
some others (xfrm ones) need to be declared.

The driver/net/rrunner.c just uses same extern as well, so
cleanup it also.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/rrunner.c

@@ -79,12 +79,10 @@ static char version[] __devinitdata = "rrunner.c: v0.50 11/11/2002  Jes Sorensen
  */
 
 /*
- * These are checked at init time to see if they are at least 256KB
- * and increased to 256KB if they are not. This is done to avoid ending
- * up with socket buffers smaller than the MTU size,
+ * sysctl_[wr]mem_max are checked at init time to see if they are at
+ * least 256KB and increased to 256KB if they are not. This is done to
+ * avoid ending up with socket buffers smaller than the MTU size,
  */
-extern __u32 sysctl_wmem_max;
-extern __u32 sysctl_rmem_max;
 
 static int __devinit rr_init_one(struct pci_dev *pdev,
 	const struct pci_device_id *ent)

include/net/xfrm.h

@@ -37,6 +37,8 @@
 extern struct sock *xfrm_nl;
 extern u32 sysctl_xfrm_aevent_etime;
 extern u32 sysctl_xfrm_aevent_rseqth;
+extern int sysctl_xfrm_larval_drop;
+extern u32 sysctl_xfrm_acq_expires;
 
 extern struct mutex xfrm_cfg_mutex;
 

net/core/sysctl_net_core.c

@@ -9,25 +9,12 @@
 #include <linux/sysctl.h>
 #include <linux/module.h>
 #include <linux/socket.h>
+#include <linux/netdevice.h>
 #include <net/sock.h>
+#include <net/xfrm.h>
 
 #ifdef CONFIG_SYSCTL
 
-extern int netdev_max_backlog;
-extern int weight_p;
-
-extern __u32 sysctl_wmem_max;
-extern __u32 sysctl_rmem_max;
-
-extern int sysctl_core_destroy_delay;
-
-#ifdef CONFIG_XFRM
-extern u32 sysctl_xfrm_aevent_etime;
-extern u32 sysctl_xfrm_aevent_rseqth;
-extern int sysctl_xfrm_larval_drop;
-extern u32 sysctl_xfrm_acq_expires;
-#endif
-
 ctl_table core_table[] = {
 #ifdef CONFIG_NET
 	{