linux-kernel - Re: [PATCH 1/2] x86/vdso: remove -nostdlib compiler flag

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Message-ID: <CAKwvOdmEU+GD3d+p8n3jnToKXgGcQN4EWSd+ATg_gs4Cwr4+gQ@mail.gmail.com>
Date:   Wed, 10 Nov 2021 12:01:09 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        clang-built-linux@...glegroups.com,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86/vdso: remove -nostdlib compiler flag

On Sun, Nov 7, 2021 at 8:27 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> The -nostdlib option requests the compiler to not use the standard
> system startup files or libraries when linking. It is effective only
> when $(CC) is used as a linker driver.
>
> Since
>
>   379d98ddf413 ("x86: vdso: Use $LD instead of $CC to link")
>
> $(LD) is directly used, hence -nostdlib is unneeded.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>
>  arch/x86/entry/vdso/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
> index a2dddcc189f6..693f8b9031fb 100644
> --- a/arch/x86/entry/vdso/Makefile
> +++ b/arch/x86/entry/vdso/Makefile
> @@ -172,7 +172,7 @@ $(obj)/vdso32.so.dbg: $(obj)/vdso32/vdso32.lds $(vobjs32) FORCE
>  # The DSO images are built using a special linker script.
>  #
>  quiet_cmd_vdso = VDSO    $@
> -      cmd_vdso = $(LD) -nostdlib -o $@ \
> +      cmd_vdso = $(LD) -o $@ \
>                        $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
>                        -T $(filter %.lds,$^) $(filter %.o,$^) && \
>                  sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
> --
> 2.30.2
>
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-- 
Thanks,
~Nick Desaulniers