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kbuild: Show marked Kconfig fragments in "help"

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Currently the Kconfig fragments in kernel/configs and arch/*/configs
that aren't used internally aren't discoverable through "make help",
which consists of hard-coded lists of config fragments. Instead, list
all the fragment targets that have a "# Help: " comment prefix so the
targets can be generated dynamically.

Add logic to the Makefile to search for and display the fragment and
comment. Add comments to fragments that are intended to be direct targets.

Signed-off-by: Kees Cook <keescook@chromium.org>
Co-developed-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Kees Cook
2023-08-31 12:13:39 -07:00
committed by Masahiro Yamada
parent 7cd343008b
commit feec5e1f74
20 changed files with 34 additions and 9 deletions
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15
scripts/kconfig/Makefile
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@@ -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)
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;)
# ===========================================================================
# object files used by all kconfig flavours