[PATCH] kconfig: Add a build target for checking current config for issues

[Tomasz Figa]

The new target is called 'checkconfig' and currently is basically an
alias for `listnewconfig` with KCONFIG_WARN_UNKNOWN_SYMBOLS set to true.
It can be used to validate if the current config is directly compatible
with the current kernel version or needs some manual adjustment.

Signed-off-by: Tomasz Figa <tfiga@xxxxxxxxxxxx>
---
 scripts/kconfig/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 4eee155121a8..501cb9b76414 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -81,6 +81,9 @@ PHONY += savedefconfig defconfig
 savedefconfig: $(obj)/conf
 	$(Q)$< $(silent) --$@=defconfig $(Kconfig)
 
+checkconfig: $(obj)/conf
+	$(Q)KCONFIG_WARN_UNKNOWN_SYMBOLS=true $< --listnewconfig $(Kconfig)
+
 defconfig: $(obj)/conf
 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)),)
 	@$(kecho) "*** Default configuration is based on '$(KBUILD_DEFCONFIG)'"
@@ -144,6 +147,7 @@ help:
 	@echo  '                    default value without prompting'
 	@echo  '  tinyconfig	  - Configure the tiniest possible kernel'
 	@echo  '  testconfig	  - Run Kconfig unit tests (requires python3 and pytest)'
+	@echo  '  checkconfig	  - Check current config for unrecognized and new symbols'
 	@echo  ''
 	@echo  'Configuration topic targets:'
 	@$(foreach f, $(all-config-fragments), \
-- 
2.43.0.472.g3155946c3a-goog