linux-kernel - Re: [PATCH 6/8] kbuild: move more module installation code to scripts/Makefile.modinst

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Message-ID: <ZOyuY5XCfYEV8fW6@bergen.fjasle.eu>
Date:   Mon, 28 Aug 2023 16:25:39 +0200
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH 6/8] kbuild: move more module installation code to
 scripts/Makefile.modinst

On Wed 23 Aug 2023 20:50:46 GMT, Masahiro Yamada wrote:
> Move more relevant code to scripts/Makefile.modinst.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  Makefile                 | 34 +++++++--------------------------
>  scripts/Makefile.modinst | 41 +++++++++++++++++++++++++++++++++++++---
>  2 files changed, 45 insertions(+), 30 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 7d9cab3d2186..82d22debf6c9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1477,24 +1477,6 @@ endif
>  
>  endif # CONFIG_MODULES
>  
> -modinst_pre :=
> -ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
> -modinst_pre := __modinst_pre
> -endif
> -
> -modules_install: $(modinst_pre)
> -PHONY += __modinst_pre
> -__modinst_pre:
> -	@rm -rf $(MODLIB)/kernel
> -	@rm -f $(MODLIB)/build
> -	@mkdir -p $(MODLIB)
> -ifdef CONFIG_MODULES
> -	@ln -s $(CURDIR) $(MODLIB)/build
> -	@sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
> -endif
> -	@cp -f modules.builtin $(MODLIB)/
> -	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
> -
>  ###
>  # Cleaning is done on three levels.
>  # make clean     Delete most generated files
> @@ -1836,12 +1818,15 @@ help:
>  	@echo  '  clean           - remove generated files in module directory only'
>  	@echo  ''
>  
> +ifndef CONFIG_MODULES
> +modules modules_install: __external_modules_error
>  __external_modules_error:
>  	@echo >&2 '***'
>  	@echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
>  	@echo >&2 '*** You cannot build or install external modules.'
>  	@echo >&2 '***'
>  	@false
> +endif
>  
>  endif # KBUILD_EXTMOD
>  
> @@ -1850,6 +1835,9 @@ endif # KBUILD_EXTMOD
>  
>  PHONY += modules modules_install modules_prepare
>  
> +modules_install:
> +	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst

I was a bit surprised to see 'modules_install' being allowed 
unconditionally for in-tree usage (thus, even if CONFIG_MODULES=n), but 
then realised that this is the same behaviour as we had before.  Out of 
curiosity:  _why_ do we need to install 
$(MODLIB)/modules.builtin{,.modinfo} also for configs w/ 
CONFIG_MODULES=n?

> +
>  ifdef CONFIG_MODULES
>  
>  $(MODORDER): $(build-dir)
> @@ -1866,17 +1854,9 @@ PHONY += modules_check
>  modules_check: $(MODORDER)
>  	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
>  
> -modules_install:
> -	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
> -
>  else # CONFIG_MODULES
>  
> -# Modules not configured
> -# ---------------------------------------------------------------------------
> -
> -PHONY += __external_modules_error
> -
> -modules modules_install: __external_modules_error
> +modules:
>  	@:
>  
>  KBUILD_MODULES :=
> diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
> index 5d687a453d90..dc7c54669082 100644
> --- a/scripts/Makefile.modinst
> +++ b/scripts/Makefile.modinst
> @@ -13,9 +13,41 @@ install-y :=
>  
>  PHONY += prepare
>  
> +ifeq ($(KBUILD_EXTMOD)$(modules_sign_only),)
> +
> +# Install more files for in-tree modules_install
> +
> +prepare:
> +	$(Q)rm -fr $(MODLIB)/kernel $(MODLIB)/build
> +	$(Q)mkdir -p $(sort $(dir $(install-y)))
> +
> +install-$(CONFIG_MODULES) += $(addprefix $(MODLIB)/, build modules.order)
> +
> +$(MODLIB)/build: FORCE
> +	$(call cmd,symlink)
> +
> +quiet_cmd_symlink = SYMLINK $@
> +      cmd_symlink = ln -s $(CURDIR) $@
> +
> +$(MODLIB)/modules.order: modules.order FORCE
> +	$(call cmd,install_modorder)
> +
> +quiet_cmd_install_modorder = INSTALL $@
> +      cmd_install_modorder = sed 's:^\(.*\)\.o$$:kernel/\1.ko:' $< > $@
> +
> +# Install modules.builtin(.modinfo) even when CONFIG_MODULES is disabled.
> +install-y += $(addprefix $(MODLIB)/, modules.builtin modules.builtin.modinfo)
> +
> +$(addprefix $(MODLIB)/, modules.builtin modules.builtin.modinfo): $(MODLIB)/%: % FORCE
> +	$(call cmd,install)
> +
> +else
> +
>  prepare:
>  	$(Q)mkdir -p $(sort $(dir $(install-y)))
>  
> +endif
> +
>  modules := $(call read-file, $(MODORDER))
>  
>  ifeq ($(KBUILD_EXTMOD),)
> @@ -34,9 +66,10 @@ suffix-$(CONFIG_MODULE_COMPRESS_XZ)	:= .xz
>  suffix-$(CONFIG_MODULE_COMPRESS_ZSTD)	:= .zst
>  
>  modules := $(patsubst $(extmod_prefix)%.o, $(dst)/%.ko$(suffix-y), $(modules))
> -install-y += $(modules)
>  
> -__modinst: $(modules)
> +install-$(CONFIG_MODULES) += $(modules)
> +
> +__modinst: $(install-y)
>  	@:
>  
>  #
> @@ -94,14 +127,16 @@ $(dst)/%.ko: $(extmod_prefix)%.ko FORCE
>  	$(call cmd,strip)
>  	$(call cmd,sign)
>  
> +ifdef CONFIG_MODULES
>  __modinst: depmod
>  
>  PHONY += depmod
> -depmod: $(modules)
> +depmod: $(install-y)
>  	$(call cmd,depmod)
>  
>  quiet_cmd_depmod = DEPMOD  $(MODLIB)
>        cmd_depmod = $(srctree)/scripts/depmod.sh $(KERNELRELEASE)
> +endif
>  
>  $(install-y): prepare
>  
> -- 
> 2.39.2

Thanks for cleaning up.  For me, the new rules look better than the 
original ones.

Reviewed-by: Nicolas Schier <nicolas@...sle.eu>

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