drop_reasons_unregister_subsys
void drop_reasons_unregister_subsys(enum skb_drop_reason_subsys subsys);
EXPORT_SYMBOL_GPL(drop_reasons_unregister_subsys);
drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE);
drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH);