linux-kernel - Re: [PATCH v2 2/3] MIPS: VDSO: Move disabling the VDSO logic to Kconfig

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Date:   Mon, 20 Apr 2020 11:53:55 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        linux-kbuild@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Dmitry Golovin <dima@...ovin.in>
Subject: Re: [PATCH v2 2/3] MIPS: VDSO: Move disabling the VDSO logic to Kconfig

On Sun, Apr 19, 2020 at 10:21 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> After commit 9553d16fa671 ("init/kconfig: Add LD_VERSION Kconfig"), we
> have access to GNU ld's version at configuration time. As a result, we
> can make it clearer under what configuration circumstances the MIPS VDSO
> needs to be disabled.
>
> This is a prerequisite for getting rid of the MIPS VDSO binutils
> warning and linking the VDSO when LD is ld.lld. Wrapping the call to
> ld-ifversion with CONFIG_LD_IS_LLD does not work because the config
> values are wiped away during 'make clean'.
>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>
> v1 -> v2:
>
> * New patch.
>
>  arch/mips/Kconfig         |  2 ++
>  arch/mips/vdso/Kconfig    | 18 ++++++++++++++++++
>  arch/mips/vdso/Makefile   | 30 ++----------------------------
>  arch/mips/vdso/vdso.lds.S |  2 +-
>  4 files changed, 23 insertions(+), 29 deletions(-)
>  create mode 100644 arch/mips/vdso/Kconfig
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 690718b3701a..45220e4b8a65 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -3275,3 +3275,5 @@ endmenu
>  source "drivers/firmware/Kconfig"
>
>  source "arch/mips/kvm/Kconfig"
> +
> +source "arch/mips/vdso/Kconfig"
> diff --git a/arch/mips/vdso/Kconfig b/arch/mips/vdso/Kconfig
...
> --- /dev/null
> +++ b/arch/mips/vdso/Kconfig
...
> +config MIPS_DISABLE_VDSO
> +       def_bool CPU_MICROMIPS || (!CPU_MIPSR6 && !MIPS_LD_CAN_LINK_VDSO)
...
> diff --git a/arch/mips/vdso/vdso.lds.S b/arch/mips/vdso/vdso.lds.S
...
> --- a/arch/mips/vdso/vdso.lds.S
> +++ b/arch/mips/vdso/vdso.lds.S
...
> -#ifndef DISABLE_MIPS_VDSO
> +#ifndef CONFIG_DISABLE_MIPS_VDSO

Should be s/CONFIG_DISABLE_MIPS_VDSO/CONFIG_MIPS_DISABLE_VDSO ?

- Sedat -