-define mergeconfig
-$(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
-$(if $(call configfiles,$(1)),, $(error No configuration exists for this target on this architecture))
-$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(call configfiles,$(1))
-$(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
-endef
+%.config: $(obj)/conf
+ $(if $(call configfiles),, $(error No configuration exists for this target on this architecture))
+ $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m .config $(configfiles)
+ +$(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig