linux-kernel - Re: [PATCH 2/2] kbuild: refactor the prerequisites of the modpost rule

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Message-ID: <Y5vt9VAq+4ZwM+fD@bergen.fjasle.eu>
Date:   Fri, 16 Dec 2022 05:03:01 +0100
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 2/2] kbuild: refactor the prerequisites of the modpost
 rule

On Sun 11 Dec 2022 22:04:08 GMT, Masahiro Yamada wrote:
> The prerequisites of modpost are cluttered. The variables 
> *-if-present
> and *-if-needed are unreadable.
> 
> It is cleaner to append them into modpost-deps.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---

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




>  scripts/Makefile.modpost | 36 ++++++++++++++++++++++--------------
>  1 file changed, 22 insertions(+), 14 deletions(-)
> 
> diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
> index f814a6acd200..5eb5e8280379 100644
> --- a/scripts/Makefile.modpost
> +++ b/scripts/Makefile.modpost
> @@ -38,6 +38,8 @@ __modpost:
>  include include/config/auto.conf
>  include $(srctree)/scripts/Kbuild.include
>  
> +MODPOST = scripts/mod/modpost
> +
>  modpost-args =										\
>  	$(if $(CONFIG_MODVERSIONS),-m)							\
>  	$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a)					\
> @@ -46,6 +48,8 @@ modpost-args =										\
>  	$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)	\
>  	-o $@
>  
> +modpost-deps := $(MODPOST)
> +
>  # 'make -i -k' ignores compile errors, and builds as many modules as possible.
>  ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
>  modpost-args += -n
> @@ -78,12 +82,13 @@ targets += .vmlinux.objs
>  .vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
>  	$(call if_changed,vmlinux_objs)
>  
> -vmlinux.o-if-present := $(wildcard vmlinux.o)
> -output-symdump := vmlinux.symvers
> -
> -ifdef KBUILD_MODULES
> -output-symdump := $(if $(vmlinux.o-if-present), Module.symvers, modules-only.symvers)
> -missing-input := $(filter-out $(vmlinux.o-if-present),vmlinux.o)
> +ifeq ($(wildcard vmlinux.o),)
> +missing-input := vmlinux.o
> +output-symdump := modules-only.symvers
> +else
> +modpost-args += vmlinux.o
> +modpost-deps += vmlinux.o
> +output-symdump := $(if $(KBUILD_MODULES), Module.symvers, vmlinux.symvers)
>  endif
>  
>  else
> @@ -95,11 +100,16 @@ src := $(obj)
>  # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
>  include $(kbuild-file)
>  
> -module.symvers-if-present := $(wildcard Module.symvers)
>  output-symdump := $(KBUILD_EXTMOD)/Module.symvers
> -missing-input := $(filter-out $(module.symvers-if-present), Module.symvers)
>  
> -modpost-args += -e $(addprefix -i ,$(module.symvers-if-present) $(KBUILD_EXTRA_SYMBOLS))
> +ifeq ($(wildcard Module.symvers),)
> +missing-input := Module.symvers
> +else
> +modpost-args += -i Module.symvers
> +modpost-deps += Module.symvers
> +endif
> +
> +modpost-args += -e $(addprefix -i , $(KBUILD_EXTRA_SYMBOLS))
>  
>  endif # ($(KBUILD_EXTMOD),)
>  
> @@ -108,12 +118,10 @@ modpost-args += -w
>  endif
>  
>  ifdef KBUILD_MODULES
> -modorder-if-needed := $(MODORDER)
>  modpost-args += -T $(MODORDER)
> +modpost-deps += $(MODORDER)
>  endif
>  
> -MODPOST = scripts/mod/modpost
> -
>  # Read out modules.order to pass in modpost.
>  # Otherwise, allmodconfig would fail with "Argument list too long".
>  quiet_cmd_modpost = MODPOST $@
> @@ -122,10 +130,10 @@ quiet_cmd_modpost = MODPOST $@
>  		echo >&2 "WARNING: $(missing-input) is missing."; \
>  		echo >&2 "         Modules may not have dependencies or modversions."; \
>  		echo >&2 "         You may get many unresolved symbol warnings.";) \
> -	$(MODPOST) $(modpost-args) $(vmlinux.o-if-present)
> +	$(MODPOST) $(modpost-args)
>  
>  targets += $(output-symdump)
> -$(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(module.symvers-if-present) $(MODPOST) FORCE
> +$(output-symdump): $(modpost-deps) FORCE
>  	$(call if_changed,modpost)
>  
>  __modpost: $(output-symdump)
> -- 
> 2.34.1

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