linux-kernel - Re: [PATCH 13/13] kbuild: merge cmd_ar_builtin and cmd_ar

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Date:   Wed, 18 Aug 2021 20:01:58 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org,
        Sami Tolvanen <samitolvanen@...gle.com>,
        linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH 13/13] kbuild: merge cmd_ar_builtin and cmd_ar_module

On Thu, Aug 19, 2021 at 09:57:44AM +0900, Masahiro Yamada wrote:
> The difference between cmd_ar_builtin and cmd_ar_module is the
> '[M]' in the short log.
> 
> Merge them into cmd_ar_thin.
> 
> $(quiet_modtag) is expanded to '[M]' when it is merging module objects.

Yup, good good!

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  scripts/Makefile.build | 12 +++---------
>  scripts/Makefile.lib   |  5 ++++-
>  2 files changed, 7 insertions(+), 10 deletions(-)
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 97392c26ebd7..17ce37c3eceb 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -370,11 +370,8 @@ $(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
>  # Rule to compile a set of .o files into one .a file (without symbol table)
>  #
>  
> -quiet_cmd_ar_builtin = AR      $@
> -      cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
> -
>  $(obj)/built-in.a: $(real-obj-y) FORCE
> -	$(call if_changed,ar_builtin)
> +	$(call if_changed,ar_thin)
>  
>  #
>  # Rule to create modules.order file
> @@ -434,14 +431,11 @@ cmd_ld_o_a += ; $(objtool) $(objtool_args) --module $@
>  endif
>  endif
>  
> -quiet_cmd_ar_module = AR [M]  $@
> -      cmd_ar_module = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
> -
>  $(modules-single): %.a: %.o FORCE
> -	$(call if_changed,ar_module)
> +	$(call if_changed,ar_thin)
>  
>  $(modules-multi): FORCE
> -	$(call if_changed,ar_module)
> +	$(call if_changed,ar_thin)
>  $(call multi_depend, $(modules-multi), .a, -objs -y -m)
>  
>  targets += $(modules-single) $(modules-multi)
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index f604d2d01cad..bd71a7d6fbc1 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -198,7 +198,7 @@ _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
>  endif
>  endif
>  
> -part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
> +part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m) $(obj-m)),y)
>  quiet_modtag = $(if $(part-of-module),[M],   )
>  
>  modkern_cflags =                                          \
> @@ -276,6 +276,9 @@ quiet_cmd_ld = LD      $@
>  quiet_cmd_ar = AR      $@
>        cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
>  
> +quiet_cmd_ar_thin = AR $(quiet_modtag)  $@
> +      cmd_ar_thin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
> +
>  # Objcopy
>  # ---------------------------------------------------------------------------
>  
> -- 
> 2.30.2
> 

-- 
Kees Cook