[PATCH] config: define CONFIG to allow different defconfigs for each ARCH

[Carmelo AMOROSO]

Add a new option CONFIG to specify different defconfigs for each ARCH.
The naming convention assume that the defconfig are defined as
$(ARCH)_$(CONFIG)

i.e.
make ARCH=sh CONFIG=prelink defconfig

will look for extra/Configs/defconfigs/sh_prelink

Signed-off-by: Carmelo Amoroso <carmelo.amoroso at st.com>
---
 Makefile.help |    2 ++
 Makefile.in   |    6 +++++-
 2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/Makefile.help b/Makefile.help
index d99cf96..006f0c7 100644
--- a/Makefile.help
+++ b/Makefile.help
@@ -50,6 +50,8 @@ help:
 	@echo '  V=2			- Very verbose build'
 	@echo '  CROSS=		- Override CROSS_COMPILER_PREFIX from .config'
 	@echo '  ARCH= 		- Use given arch for config targets'
+	@echo '  CONFIG=		- Use given CONFIG to specify a specific defconfig for the given ARCH'
+	@echo '			  based on the following naming convention: ARCH_CONFIG'
 	@echo '  SHELL=		- Shell to use for make'
 	@echo '  CONFIG_SHELL=		- Shell to use for menuconfig'
 	@echo
diff --git a/Makefile.in b/Makefile.in
index ad9e629..4975598 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -447,9 +447,13 @@ allyesconfig: $(top_builddir)extra/config/conf
 allnoconfig: $(top_builddir)extra/config/conf
 	$(Q)$(top_builddir)extra/config/conf -n extra/Configs/Config.in
 
+ifdef CONFIG
+CONFIG_SFX=_$(CONFIG)
+endif
+
 defconfig: $(top_builddir)extra/config/conf
 	$(Q)$(top_builddir)extra/config/conf \
-		-D extra/Configs/defconfigs/$(ARCH) extra/Configs/Config.in
+		-D extra/Configs/defconfigs/$(ARCH)$(CONFIG_SFX) extra/Configs/Config.in
 
 menuconfig-clean-y:
 	$(Q)$(MAKE) -C extra/config CLEAN_extra/config
-- 
1.7.4.4