kbuild: add generic mergeconfig target, %.config

"scripts/kconfig/merge_config.sh && make oldconfig" works well
enough for merging local config fragments, but Kbuild currently has
the entry points only for "kvmconfig" and "tinyconfig".

This commit provides the generic target for mergeconfig, so we can
manage our own config fragments easily:
put "foo.config" in arch/$(SRCARCH)/configs/ or kernel/configs/,
and then run "make foo.config".

Now "make kvmconfig" is just a shorthand of "make kvm_guest.config".
Likewise, "make tinyconfig" is equivalent to
"make allnoconfig tiny.config".

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

1 files changed, 9 insertions, 10 deletions

diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index b0e4be28204d..cb2cf548c45c 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -104,21 +104,20 @@ endif
 %_defconfig: $(obj)/conf
         $(Q)$< --defconfig=arch/$(SRCARCH)/configs/$@ $(Kconfig)
 
-configfiles=$(wildcard $(srctree)/kernel/configs/$(1).config $(srctree)/arch/$(SRCARCH)/configs/$(1).config)
+configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/configs/$@)
 
-define mergeconfig
-$(if $(call configfiles,$(1)),, $(error No configuration exists for this target on this architecture))
-$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m .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
 
 PHONY += kvmconfig
-kvmconfig:
-        $(call mergeconfig,kvm_guest)
+kvmconfig: kvm_guest.config
+        @:
 
 PHONY += tinyconfig
-tinyconfig: allnoconfig
-        $(call mergeconfig,tiny)
+tinyconfig:
+        $(Q)$(MAKE) -f $(srctree)/Makefile allnoconfig tiny.config
 
 # Help text used by make help
 help: