int xfrm_unregister_km(struct xfrm_mgr *km)
{
	spin_lock_bh(&xfrm_km_lock);
	list_del_rcu(&km->list);
	spin_unlock_bh(&xfrm_km_lock);
	synchronize_rcu();
	return 0;
}
int xfrm_unregister_km(struct xfrm_mgr *km)
{
	spin_lock_bh(&xfrm_km_lock);
	list_del_rcu(&km->list);
	spin_unlock_bh(&xfrm_km_lock);
	synchronize_rcu();
	return 0;
}