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 19:42:56 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Sedat Dilek <sedat.dilek@...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 Mon, Apr 20, 2020 at 11:53:55AM +0200, Sedat Dilek wrote:
> 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 -

Ugh yes, thank you much for pointing it out.

I'll send a v3 once I get further feedback on the series.

Cheers!
Nathan