diff --git a/drivers/net/rrunner.c b/drivers/net/rrunner.c
index 19152f54ef2b4f80a357b4b2ba59393a3ab721aa..b822859c8de31079dbb100c4cf91a1947fc87184 100644
--- a/drivers/net/rrunner.c
+++ b/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)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 688f6f5d3285bf1cc6ae88850c7008ff1fd6d5a2..58dfa82889aa498be489d11ada7a163f3277f134 100644
--- a/include/net/xfrm.h
+++ b/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;
 
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 6d5ea97620408a41e4b05a71d4e6b159c2228354..113cc728dc3190d90d493078aac5c02ab33f012f 100644
--- a/net/core/sysctl_net_core.c
+++ b/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
 	{