linux-kernel - Re: [PATCH RFC] x86: remove toolchain check for X32 ABI capability

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Message-ID: <CAK7LNASY_+_38XEMLZAf7txr4EdukkcFL8pnGGe2XyhQ9F4oDQ@mail.gmail.com>
Date:   Mon, 7 Jun 2021 16:39:16 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     X86 ML <x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Fangrui Song <maskray@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        "H . J . Lu" <hjl.tools@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Brian Gerst <brgerst@...il.com>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Chao Yu <chao@...nel.org>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jethro Beekman <jethro@...tanix.com>,
        Kees Cook <keescook@...omium.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sasha Levin <sashal@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Takashi Iwai <tiwai@...e.com>,
        ALSA Development Mailing List <alsa-devel@...a-project.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>
Subject: Re: [PATCH RFC] x86: remove toolchain check for X32 ABI capability

On Sun, Feb 28, 2021 at 3:49 PM Nathan Chancellor <nathan@...nel.org> wrote:
>
> On Sun, Feb 28, 2021 at 12:15:16PM +0900, Masahiro Yamada wrote:
> > On Sun, Feb 28, 2021 at 3:41 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
> > >
> > > This commit reverts 0bf6276392e9 ("x32: Warn and disable rather than
> > > error if binutils too old").
> > >
> > > The help text in arch/x86/Kconfig says enabling the X32 ABI support
> > > needs binutils 2.22 or later. This is met because the minimal binutils
> > > version is 2.23 according to Documentation/process/changes.rst.
> > >
> > > I would not say I am not familiar with toolchain configuration, but
> >
> > I mean:
> > I would not say I am familiar ...
> > That is why I added RFC.
> >
> > I appreciate comments from people who are familiar
> > with toolchains (binutils, llvm).
> >
> > If this change is not safe,
> > we can move this check to Kconfig at least.
>
> Hi Masahiro,
>
> As Fangrui pointed out, there are two outstanding issues with x32 with
> LLVM=1, both seemingly related to LLVM=1.

Is this still a problem for Clang built Linux?



> https://github.com/ClangBuiltLinux/linux/issues/514

I am not tracking the status.
What was the conclusion?

> https://github.com/ClangBuiltLinux/linux/issues/1141


This got marked "unreproducible"

>
> Additionally, there appears to be one from Arnd as well but that one has
> received no triage yet.
>
> https://github.com/ClangBuiltLinux/linux/issues/1205

Same as well.


>
> I intend to test this patch as well as a few others at some point in the
> coming week although I am having to play sysadmin due to moving servers
> so I might not be able to get to it until later in the week.
>
> Cheers,
> Nathan
>


-- 
Best Regards
Masahiro Yamada