diff -r 4ccfca658d9b -r df33992f9614 kconfig/kconfig.mk
--- a/kconfig/kconfig.mk	Sat Jul 14 18:25:47 2012 +0200
+++ b/kconfig/kconfig.mk	Fri Sep 21 16:26:10 2012 +0200
@@ -5,7 +5,7 @@
 #-----------------------------------------------------------
 # The configurators rules
 
-configurators = menuconfig nconfig oldconfig
+configurators = menuconfig nconfig oldconfig defconfig olddefconfig
 PHONY += $(configurators)
 
 $(configurators): config_files
@@ -27,6 +27,14 @@
 	@$(ECHO) "  CONF  $(KCONFIG_TOP)"
 	$(SILENT)$(CONF) --silent$@ $(KCONFIG_TOP)
 
+defconfig: .config
+	@$(ECHO) '  GEN   $@'
+	$(SILENT)$(CONF) --savedefconfig=$${CONFIG-defconfig} $(KCONFIG_TOP)
+
+olddefconfig:
+	@$(ECHO) '  CONF  $@'
+	$(SILENT)$(CONF) --defconfig=$${CONFIG-defconfig} $(KCONFIG_TOP)
+
 # Always be silent, the stdout an be >.config
 extractconfig:
 	@$(awk) 'BEGIN { dump=0; }                                                  \
@@ -50,3 +58,6 @@
 	@echo  '  oldconfig          - Update current config using a provided .config as base'
 	@echo  '  extractconfig      - Extract to stdout the configuration items from a'
 	@echo  '                       build.log file piped to stdin'
+	@echo  '  defconfig          - Save current config as a mini-defconfig to $${CONFIG}'
+	@echo  '  olddefconfig       - Update config from a mini-defconfig $${CONFIG}'
+	@echo  '                       (default: $${CONFIG}=./defconfig)'