From: John W. Linville <linville@redhat.com>
Subject: [RFC/PATCH rhel5] d80211: kABI pre-compatibility
Date: Wed, 15 Nov 2006 14:54:25 -0500
Bugzilla: 214982
Message-Id: <20061115195425.GC9964@redhat.com>
Changelog: d80211: kABI pre-compatibility


We are almost certainly going to need to pull some version of the
d80211 wireless stack into RHEL5 during it's lifetime, possibly as
early as U1.  This raises the usual kABI concerns related to such a
big chunk of code.

Perhaps surprisingly, the current kABI intrusiveness of d80211 is
fairly small.  These changes currently consist of a couple of fields
in the net_device structure, although it is difficult to be sure they
will remain so.  Still, it would be better to have a couple fewer
things to hack around due to kABI concerns later.

--- linux-2.6.18.noarch/include/linux/netdevice.h.orig	2006-09-19 23:42:06.000000000 -0400
+++ linux-2.6.18.noarch/include/linux/netdevice.h	2006-11-15 14:45:14.000000000 -0500
@@ -342,6 +342,9 @@ struct net_device
 	/* Instance data managed by the core of Wireless Extensions. */
 	struct iw_public_data *	wireless_data;
 
+	/* pending config used by cfg80211/wext compat code only */
+	void *cfg80211_wext_pending_config;
+
 	struct ethtool_ops *ethtool_ops;
 
 	/*
@@ -386,6 +389,7 @@ struct net_device
 	void                    *ip6_ptr;       /* IPv6 specific data */
 	void			*ec_ptr;	/* Econet specific data	*/
 	void			*ax25_ptr;	/* AX.25 specific data */
+	void			*ieee80211_ptr;	/* IEEE 802.11 specific data */
 
 /*
  * Cache line mostly used on receive path (including eth_type_trans())
-- 
John W. Linville
linville@redhat.com