linux-kernel - Re: [PATCH 1/4] x86: add __X32_COND

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Date:   Sat, 19 Sep 2020 09:23:22 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Eric Biederman <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>, kexec@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Christoph Hellwig <hch@....de>, Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH 1/4] x86: add __X32_COND_SYSCALL() macro

On Fri, Sep 18, 2020 at 10:35 PM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Fri, Sep 18, 2020 at 03:24:36PM +0200, Arnd Bergmann wrote:
> > sys_move_pages() is an optional syscall, and once we remove
> > the compat version of it in favor of the native one with an
> > in_compat_syscall() check, the x32 syscall table refers to
> > a __x32_sys_move_pages symbol that may not exist when the
> > syscall is disabled.
> >
> > Change the COND_SYSCALL() definition on x86 to also include
> > the redirection for x32.
> >
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> Adding the x86 maintainers and Brian Gerst.  Brian proposed another
> problem to the mess that most of the compat syscall handlers used by
> x32 here:
>
>    https://lkml.org/lkml/2020/6/16/664
>
> hpa didn't particularly like it, but with your and my pending series
> we'll soon use more native than compat syscalls for x32, so something
> will need to change..

I'm fine with either solution.