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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>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	clang-built-linux@googlegroups.com
Subject: Re: [PATCH 12/13] kbuild: merge cmd_modversions_c and cmd_modversions_S
Date: Wed, 18 Aug 2021 20:06:00 -0700	[thread overview]
Message-ID: <202108182005.AD31690E@keescook> (raw)
In-Reply-To: <20210819005744.644908-13-masahiroy@kernel.org>

On Thu, Aug 19, 2021 at 09:57:43AM +0900, Masahiro Yamada wrote:
> Now cmd_modversions_c and cmd_modversions_S are similar.
> 
> The latter uses $(OBJDUMP) -h, but it can be replaced with $(NM).
> 
> $(NM) works for both ELF and LLVM bitcode (if $(NM) is llvm-nm).
> 
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Ah yeah. That's nice consolidation.

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

-Kees

> ---
> 
>  scripts/Makefile.build | 15 ++++++---------
>  1 file changed, 6 insertions(+), 9 deletions(-)
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 874e84a1f3fc..97392c26ebd7 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -166,13 +166,16 @@ ifdef CONFIG_MODVERSIONS
>  
>  # Generate .o.symversions files for each .o with exported symbols, and link these
>  # to the kernel and/or modules at the end.
> -cmd_modversions_c =								\
> +cmd_modversions =								\
>  	if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then			\
> -		$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))	\
> +		$(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
>  		    > $@.symversions;						\
>  	else									\
>  		rm -f $@.symversions;						\
>  	fi;
> +
> +cmd_modversions_c = $(call cmd_modversions,c)
> +
>  endif
>  
>  ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
> @@ -327,14 +330,8 @@ ifdef CONFIG_ASM_MODVERSIONS
>  
>  # versioning matches the C process described above, with difference that
>  # we parse asm-prototypes.h C header to get function definitions.
> +cmd_modversions_S = $(call cmd_modversions,S)
>  
> -cmd_modversions_S =								\
> -	if $(OBJDUMP) -h $@ | grep -q __ksymtab; then				\
> -		$(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))	\
> -		    > $@.symversions;						\
> -	else									\
> -		rm -rf $@.symversions;						\
> -	fi
>  endif
>  
>  $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
> -- 
> 2.30.2
> 

-- 
Kees Cook

  reply	other threads:[~2021-08-19  3:06 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 [this message]
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
2021-08-25  4:57 ` [PATCH 00/13] kbuild: refactoring after Clang LTO Masahiro Yamada

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