Kernels >= 2.6.32 can identify the type of device netdevice
so that sysfs can be used to get this. We never really had a
systematic way of doing this -- now we do through the
SET_NETDEV_DEVTYPE() macro. For older kernels we make the
SET_NETDEV_DEVTYPE() be a no-op this means the wireless type
we define is unused so we ucomment it simply to avoid a
compile warning.

--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -784,9 +784,11 @@ static void wdev_cleanup_work(struct wor
 	dev_put(wdev->netdev);
 }
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32))
 static struct device_type wiphy_type = {
 	.name	= "wlan",
 };
+#endif
 
 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 					 unsigned long state,
--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -549,9 +549,11 @@ static struct device *bnep_get_device(st
 	return conn ? &conn->dev : NULL;
 }
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32))
 static struct device_type bnep_type = {
 	.name	= "bluetooth",
 };
+#endif
 
 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
 {
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1290,13 +1290,17 @@ static const struct net_device_ops usbne
 
 // precondition: never called in_interrupt
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32))
 static struct device_type wlan_type = {
 	.name	= "wlan",
 };
+#endif
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32))
 static struct device_type wwan_type = {
 	.name	= "wwan",
 };
+#endif
 
 int
 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)