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

[Nathan Chancellor <nathan@kernel.org>]

On Sun, Nov 08, 2026 at 06:59:45PM +0000, Julian Braha wrote:
> On 11/6/26 09:19, Ahmed S. Darwish wrote:
> > 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@linutronix.de>
> > ---
> >  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
> > 
> 
> I think this tool may belong in scripts/ due to the kbuild integration,
> as was mentioned in the past on another tool review:
> 
> https://lore.kernel.org/linux-kbuild/20260428183101.GA3304253@ax162/

Yeah, while I would prefer for the script to live in scripts/ due to
being called from Kbuild, I am not sure if the rules/schemas belong
there? It might be better to keep everything in tools/ for that reason,
especially if this may be called externally, but I am open to other
thoughts.

-- 
Cheers,
Nathan