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Message-ID: <CAK8P3a0V+xboaGAF2nqrYtpjXXA7y0LcvCKi4ngLTus1D_XZBA@mail.gmail.com>
Date:   Fri, 18 Jan 2019 20:33:25 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     y2038 Mailman List <y2038@...ts.linaro.org>,
        Linux API <linux-api@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Matt Turner <mattst88@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Michal Simek <monstr@...str.eu>,
        Paul Burton <paul.burton@...s.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        Max Filippov <jcmvbkbc@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Firoz Khan <firoz.khan@...aro.org>,
        alpha <linux-alpha@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-ia64@...r.kernel.org,
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        Parisc List <linux-parisc@...r.kernel.org>,
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        Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2 29/29] y2038: add 64-bit time_t syscalls to all 32-bit architectures

On Fri, Jan 18, 2019 at 7:50 PM Andy Lutomirski <luto@...nel.org> wrote:
> On Fri, Jan 18, 2019 at 8:25 AM Arnd Bergmann <arnd@...db.de> wrote:
> > - Once we get to 512, we clash with the x32 numbers (unless
> >   we remove x32 support first), and probably have to skip
> >   a few more. I also considered using the 512..547 space
> >   for 32-bit-only calls (which never clash with x32), but
> >   that also seems to add a bit of complexity.
>
> I have a patch that I'll send soon to make x32 use its own table.  As
> far as I'm concerned, 547 is *it*.  548 is just a normal number and is
> not special.  But let's please not reuse 512..547 for other purposes
> on x86 variants -- that way lies even more confusion, IMO.

Fair enough, the space for those numbers is cheap enough here.
I take it you mean we also should not reuse that number space if
we were to decide to remove x32 soon, but you are not worried
about clashing with arch/alpha when everything else uses consistent
numbers?

       Arnd

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