linux-kernel - Re: [PATCH 00/16] x86, crypto: remove always-defined CONFIG_AS

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Message-ID: <CAK7LNAQvgT=OWVuBVrvgdZ7AAkoaV_K_Y+w9bOFxRPw_1TOSUA@mail.gmail.com>
Date:   Wed, 25 Mar 2020 14:09:34 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "H . Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Jim Kukunas <james.t.kukunas@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        NeilBrown <neilb@...e.de>, Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        intel-gfx@...ts.freedesktop.org,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 00/16] x86, crypto: remove always-defined CONFIG_AS_* and
 cosolidate Kconfig/Makefiles

Hi Ingo,

On Wed, Mar 25, 2020 at 1:59 PM Ingo Molnar <mingo@...nel.org> wrote:
>
>
> * Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> > This series of cleanups was prompted by Linus:
> > https://lkml.org/lkml/2020/3/12/726
> >
> > First, this series drop always-on CONFIG_AS_* options.
> > Some of those options were introduced in old days.
> > For example, the check for CONFIG_AS_CFI dates back to 2006.
> >
> > We raise the minimal tool versions from time to time.
> > Currently, we require binutils 2.21
> > (and we plan to bump it to 2.23 for v5.7-rc1).
> >
> > After cleaning away the old checks,
> > as-instr calls are moved to Kconfig from Makefiles.
> > (patch 11)
> >
> > This allows more Kconfig / Makefile cleanups.
> > Patch 12 is complex, but I double-checked it does the equivalent.
> >
> > Patch 14 bumps the binutils version to 2.23,
> > and patch 15 removes more CONFIG_AS_* options.
> >
> > I folded all relevanet patches into this series,
> > as suggested by Jason A. Donenfeld.
> >
> > If x86 maintainers take care of this series, that's good.
> >
> > If it is OK to queue this up to Kbuild tree,
> > I will send a pull request to Linus.
> >
> > Thank you.
>
> LGTM. I've got these four from Jason A. Donenfeld queued up in
> tip:WIP.x86/asm:
>
>  bd5b1283e41c: ("crypto: Curve25519 - do not pollute dispatcher based on assembler")
>  829f32d78588: ("crypto: X86 - rework configuration, based on Kconfig")
>  95ef9f80ed63: ("x86/build: Probe assembler from Kconfig instead of Kbuild")
>  1651e700664b: ("x86: Fix bitops.h warning with a moved cast")
>
> I suppose these might interact (maybe even conflict), and are topically
> related.
>
> Would you like to pull these into the kbuild tree? You can find them in:
>
>    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/asm
>
> Thanks,
>
>         Ingo


I did not know that these had already landed in tip tree.

They are immature version.
(In fact CONFIG_AS_CFI and AS_ADX are false-negative
if GCC that defaults to 32-bit is used.)

Can you simply discard the WIP.x86/asm branch,
and only reapply
1651e700664b: ("x86: Fix bitops.h warning with a moved cast")

?


-- 
Best Regards
Masahiro Yamada