[PATCH v2 0/2] kbuild: Show Kconfig fragments in "help"

Wed Aug 30 06:07:19 AEST 2023

On Tue, Aug 29, 2023 at 11:57:19PM +0900 Masahiro Yamada wrote:
> On Tue, Aug 29, 2023 at 3:55 PM Nicolas Schier <nicolas at fjasle.eu> wrote:
> >
> > On Mon 28 Aug 2023 16:17:07 GMT, Michael Ellerman wrote:
> > > Masahiro Yamada <masahiroy at kernel.org> writes:
> > > > On Sat, Aug 26, 2023 at 4:55 AM Kees Cook <keescook at chromium.org> wrote:
> > > >>
> > > >> Hi,
> > > >>
> > > >> This is my series to show *.config targets in the "help" target so these
> > > >> various topics can be more easily discoverd.
> > > >>
> > > >> v2:
> > > >>  - split .fragment from .config to hide "internal" fragments
> > > >
> > > > Please do not do this churn.
> > >
> > > That was my idea :}
> > >
> > > > Like Randy, I did not get "why" part quiet well,
> > > > but if you are eager about this,
> > > > you can show help message only when the following
> > > > ("# Help:" prefix for example) is found in the first line.
> > > >
> > > > # Help: blah blah
> > > > # other comment
> > >
> > > I did think of that, but wasn't sure how to do it in make.
> >
> > Something like this should do it:
> >
> >         @grep -Hnm1 -e '^# Help:' $(foreach f, $(sort $(notdir $(call configfiles,*.config))), $(firstword $(call configfiles,$(f)))) | \
> >          while read loc dummy helptext; do \
> >                 tmp="$${loc%:#}"; file="$${tmp%:*}"; line="$${tmp##*:}"; \
> >                 [ "$${line}" = "1" ] && \
> >                   printf "  %-25s - %s\\n" "$${file##*/}" "$${helptext}"; \
> >          done
> >
> > but this neither beautiful nor elegant it likes to be improved.
> >
> > Kind regards,
> > Nicolas
> 
> 
> 
> 
> The attached patch will work too.
> 
> I dropped the "in the first line" restriction
> because SPDX might be placed in the first line
> of config fragments.
> 
> 
> 
> -- 
> Best Regards
> Masahiro Yamada

> diff --git a/Makefile b/Makefile
> index e21bf66af6fd..23cd62a5ff05 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1552,7 +1552,6 @@ help:
>  	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
>  	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
>  	@echo  ''
> -	@echo  'Configuration targets:'
>  	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
>  	@echo  ''
>  	@echo  'Other generic targets:'
> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> index fdc2e3abd615..c4b2a8a19fc8 100644
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -335,9 +335,5 @@ define archhelp
>    echo  '			  bzdisk/fdimage*/hdimage/isoimage also accept:'
>    echo  '			  FDARGS="..."  arguments for the booted kernel'
>    echo  '			  FDINITRD=file initrd for the booted kernel'
> -  echo  ''
> -  echo  '  kvm_guest.config	- Enable Kconfig items for running this kernel as a KVM guest'
> -  echo  '  xen.config		- Enable Kconfig items for running this kernel as a Xen guest'
> -  echo  '  x86_debug.config	- Enable tip tree debugging options for testing'
>  
>  endef
> diff --git a/kernel/configs/kvm_guest.config b/kernel/configs/kvm_guest.config
> index 208481d91090..d0877063d925 100644
> --- a/kernel/configs/kvm_guest.config
> +++ b/kernel/configs/kvm_guest.config
> @@ -1,3 +1,4 @@
> +# Help: Bootable as a KVM guest
>  CONFIG_NET=y
>  CONFIG_NET_CORE=y
>  CONFIG_NETDEVICES=y
> diff --git a/kernel/configs/x86_debug.config b/kernel/configs/x86_debug.config
> index 6fac5b405334..35f48671b8d5 100644
> --- a/kernel/configs/x86_debug.config
> +++ b/kernel/configs/x86_debug.config
> @@ -1,3 +1,4 @@
> +# Help: Debugging options for tip tree testing
>  CONFIG_X86_DEBUG_FPU=y
>  CONFIG_LOCK_STAT=y
>  CONFIG_DEBUG_VM=y
> diff --git a/kernel/configs/xen.config b/kernel/configs/xen.config
> index 436f806aa1ed..6878b9a49be8 100644
> --- a/kernel/configs/xen.config
> +++ b/kernel/configs/xen.config
> @@ -1,3 +1,5 @@
> +# Help: Bootable as a Xen guest
> +#
>  # global stuff - these enable us to allow some
>  # of the not so generic stuff below for xen
>  CONFIG_PARAVIRT=y
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index af1c96198f49..e72c5ee659a9 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -93,11 +93,13 @@ endif
>  %_defconfig: $(obj)/conf
>  	$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$@ $(Kconfig)
>  
> -configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/configs/$@)
> +configfiles = $(wildcard $(srctree)/kernel/configs/$(1) $(srctree)/arch/$(SRCARCH)/configs/$(1))
> +all-config-fragments = $(call configfiles,*)
> +config-fragments = $(call configfiles,$@)
>  
>  %.config: $(obj)/conf
> -	$(if $(call configfiles),, $(error No configuration exists for this target on this architecture))
> -	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m .config $(configfiles)
> +	$(if $(config-fragments),, $(error $@ fragment does not exists on this architecture))
> +	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m .config $(config-fragments)
>  	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
>  
>  PHONY += tinyconfig
> @@ -115,6 +117,7 @@ clean-files += tests/.cache
>  
>  # Help text used by make help
>  help:
> +	@echo  'Configuration targets:'
>  	@echo  '  config	  - Update current config utilising a line-oriented program'
>  	@echo  '  nconfig         - Update current config utilising a ncurses menu based program'
>  	@echo  '  menuconfig	  - Update current config utilising a menu based program'
> @@ -141,6 +144,12 @@ help:
>  	@echo  '                    default value without prompting'
>  	@echo  '  tinyconfig	  - Configure the tiniest possible kernel'
>  	@echo  '  testconfig	  - Run Kconfig unit tests (requires python3 and pytest)'
> +	@echo  ''
> +	@echo  'Configuration topic targets:'
> +	@$(foreach f, $(all-config-fragments), \
> +		if help=$$(grep -m1 '^# Help: ' $(f)); then \
> +			printf '  %-25s - %s\n' '$(notdir $(f))' "$${help#*: }"; \
> +		fi;)

thanks, this looks much better, and SPDX is a good point.

Kind regards,
Nicolas
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