Don't descend to wireless and ieee802154 unless they are actually used.
Signed-off-by: Nicolas Kaiser <nikai@nikai.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
 obj-$(CONFIG_IP_DCCP)          += dccp/
 obj-$(CONFIG_IP_SCTP)          += sctp/
 obj-$(CONFIG_RDS)              += rds/
-obj-y                          += wireless/
+obj-$(CONFIG_WIRELESS)         += wireless/
 obj-$(CONFIG_MAC80211)         += mac80211/
 obj-$(CONFIG_TIPC)             += tipc/
 obj-$(CONFIG_NETLABEL)         += netlabel/
 ifneq ($(CONFIG_DCB),)
 obj-y                          += dcb/
 endif
-obj-y                          += ieee802154/
+obj-$(CONFIG_IEEE802154)       += ieee802154/
 
 ifeq ($(CONFIG_NET),y)
 obj-$(CONFIG_SYSCTL)           += sysctl_net.o