[PATCH v1 04/10] kconfig: Introduce checkconfig target

[Ahmed S. Darwish]

Add a checkconfig target to validate the current kernel .config against a
set of rules.  Select the rules using a mandatory RULES= make variable.

Example usage:

   make RULES=preempt_rt checkconfig

Use the kconfig-checker to perform all sanity checks.

Document the new target at the 'make help' text.

Signed-off-by: Ahmed S. Darwish <darwi@xxxxxxxxxxxxx>
---
 scripts/kconfig/Makefile | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 5baf1c44ffa2..d67a23730259 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -125,6 +125,26 @@ testconfig: $(obj)/conf
 	$(if $(findstring 1,$(KBUILD_VERBOSE)),--capture=no)
 clean-files += tests/.cache
 
+checkconfig := $(PYTHON3) -B $(srctree)/tools/kconfig-checker/check.py
+list_checkconfig_rules =						\
+	echo -n >&2 "Available RULES: ";				\
+	$(checkconfig) list-rules >&2;					\
+	echo >&2
+
+PHONY += checkconfig
+checkconfig:
+	$(Q)if [ -z "$(RULES)" ]; then					\
+		echo >&2 "Usage: make RULES=<profile> checkconfig";	\
+		$(list_checkconfig_rules);				\
+		exit 2;							\
+	fi
+	$(Q)if ! $(checkconfig) list-rules | grep -qw "$(RULES)"; then	\
+		echo >&2 "Unknown RULES profile = $(RULES)";		\
+		$(list_checkconfig_rules);				\
+		exit 2;							\
+	fi
+	$(Q)$(checkconfig) check -r "$(RULES)" -c "$(KCONFIG_CONFIG)"
+
 # Help text used by make help
 help:
 	@echo  'Configuration targets:'
@@ -154,6 +174,9 @@ 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 against sanity rules specified by RULES'
+	@echo  '                    Example usage: "make RULES=preempt_rt checkconfig"'
+	@echo  '                    (requires python3, PyYAML, and jsonschema)'
 	@echo  ''
 	@echo  'Configuration topic targets:'
 	@$(foreach f, $(all-config-fragments), \
-- 
2.56.0