net devices: Get network devices to show up in sysfs.

- declare net_subsys, and register during net_dev_init().
- Add kobject to struct net_device.
- initialize name and register in register_netdevice().
- remove in unregister_netdevice().

This allows one to see the registered network devices in the system via:

# tree /sys/net/
/sys/net/
`-- eth0

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 513b89ca7836..888d520fd319 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -28,6 +28,7 @@
 #include <linux/if.h>
 #include <linux/if_ether.h>
 #include <linux/if_packet.h>
+#include <linux/kobject.h>
 
 #include <asm/atomic.h>
 #include <asm/cache.h>
@@ -438,6 +439,9 @@ struct net_device
 	/* this will get initialized at each interface type init routine */
 	struct divert_blk	*divert;
 #endif /* CONFIG_NET_DIVERT */
+
+	/* generic object representation */
+	struct kobject kobj;
 };