linux-kernel - Re: [PATCH 2/2] kbuild: do not remove empty *.symtypes explicitly

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Date:   Tue, 29 Mar 2022 11:27:47 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>
Subject: Re: [PATCH 2/2] kbuild: do not remove empty *.symtypes explicitly

On Mon, Mar 28, 2022 at 7:15 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> Presumably, 'test -s $@ || rm -f $@' intends to remove the output when
> the genksyms command fails.
>
> It is unneeded because .DELETE_ON_ERROR automatically removes the output
> on failure.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>
>  scripts/Makefile.build | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 3f2985df4d60..974bb6435826 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -135,9 +135,7 @@ genksyms = scripts/genksyms/genksyms                \
>  cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms)
>
>  quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
> -cmd_cc_symtypes_c =                                                         \
> -    $(call cmd_gensymtypes_c,true,$@) >/dev/null;                           \
> -    test -s $@ || rm -f $@
> +      cmd_cc_symtypes_c = $(call cmd_gensymtypes_c,true,$@)

Was it an accident that you removed the redirection of stdout to
/dev/null here, but not also below?
If quiet_modtag silences the output, perhaps the redirection should be
dropped below as well?

>
>  $(obj)/%.symtypes : $(src)/%.c FORCE
>         $(call cmd,cc_symtypes_c)
> @@ -348,9 +346,7 @@ cmd_gensymtypes_S =                                                         \
>      $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
>
>  quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
> -cmd_cc_symtypes_S =                                                         \
> -    $(call cmd_gensymtypes_S,true,$@) >/dev/null;                           \
> -    test -s $@ || rm -f $@
> +      cmd_cc_symtypes_S = $(call cmd_gensymtypes_S,true,$@) >/dev/null
>
>  $(obj)/%.symtypes : $(src)/%.S FORCE
>         $(call cmd,cc_symtypes_S)
> --
> 2.32.0
>


-- 
Thanks,
~Nick Desaulniers