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From: Kees Cook <keescook@chromium.org>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: linux-kbuild@vger.kernel.org,
	Sami Tolvanen <samitolvanen@google.com>,
	linux-kernel@vger.kernel.org,
	Michal Marek <michal.lkml@markovi.net>,
	Nick Desaulniers <ndesaulniers@google.com>
Subject: Re: [PATCH 13/13] kbuild: merge cmd_ar_builtin and cmd_ar_module
Date: Wed, 18 Aug 2021 20:01:58 -0700	[thread overview]
Message-ID: <202108182001.8B2512CC1@keescook> (raw)
In-Reply-To: <20210819005744.644908-14-masahiroy@kernel.org>

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@chromium.org>

-Kees

> 
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.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

  reply	other threads:[~2021-08-19  3:02 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-19  0:57 [PATCH 00/13] kbuild: refactoring after Clang LTO Masahiro Yamada
2021-08-19  0:57 ` [PATCH 01/13] kbuild: move objtool_args back to scripts/Makefile.build Masahiro Yamada
2021-08-19  2:45   ` Kees Cook
2021-08-19  0:57 ` [PATCH 02/13] gen_compile_commands: extract compiler command from a series of commands Masahiro Yamada
2021-08-19  6:48   ` Kees Cook
2021-08-19  0:57 ` [PATCH 03/13] kbuild: detect objtool changes correctly and remove .SECONDEXPANSION Masahiro Yamada
2021-08-19  2:55   ` Kees Cook
2021-08-19  3:18     ` Masahiro Yamada
2021-08-19  0:57 ` [PATCH 04/13] kbuild: remove unused quiet_cmd_update_lto_symversions Masahiro Yamada
2021-08-19  6:19   ` Kees Cook
2021-08-19  0:57 ` [PATCH 05/13] kbuild: remove stale *.symversions Masahiro Yamada
2021-08-19  6:29   ` Kees Cook
2021-08-19  0:57 ` [PATCH 06/13] kbuild: merge vmlinux_link() between the ordinary link and Clang LTO Masahiro Yamada
2021-08-19  2:42   ` Kees Cook
2021-08-19  0:57 ` [PATCH 07/13] kbuild: do not remove 'linux' link in scripts/link-vmlinux.sh Masahiro Yamada
2021-08-19  6:32   ` Kees Cook
2021-08-19  0:57 ` [PATCH 08/13] kbuild: merge vmlinux_link() between ARCH=um and other architectures Masahiro Yamada
2021-08-19  2:43   ` Kees Cook
2021-08-19  0:57 ` [PATCH 09/13] kbuild: do not create built-in.a.symversions or lib.a.symversions Masahiro Yamada
2021-08-19  6:41   ` Kees Cook
2021-08-28 11:57     ` Masahiro Yamada
2021-08-19  0:57 ` [PATCH 10/13] kbuild: build modules in the same way with/without Clang LTO Masahiro Yamada
2021-08-19  6:59   ` Kees Cook
2021-08-19  8:11     ` Masahiro Yamada
2021-08-19  0:57 ` [PATCH 11/13] kbuild: always postpone CRC links for module versioning Masahiro Yamada
2021-08-19  6:43   ` Kees Cook
2021-08-19  0:57 ` [PATCH 12/13] kbuild: merge cmd_modversions_c and cmd_modversions_S Masahiro Yamada
2021-08-19  3:06   ` Kees Cook
2021-08-19  0:57 ` [PATCH 13/13] kbuild: merge cmd_ar_builtin and cmd_ar_module Masahiro Yamada
2021-08-19  3:01   ` Kees Cook [this message]
2021-08-25  4:57 ` [PATCH 00/13] kbuild: refactoring after Clang LTO Masahiro Yamada

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