linux-kernel - Re: [RFC] new SYSCALL_DEFINE/COMPAT_SYSCALL

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Date:   Mon, 26 Mar 2018 15:44:18 +0900
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arch <linux-arch@...r.kernel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        linux-mips <linux-mips@...ux-mips.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-s390 <linux-s390@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        sparclinux@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Jiri Slaby <jslaby@...e.com>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [RFC] new SYSCALL_DEFINE/COMPAT_SYSCALL_DEFINE wrappers

Hi Linus!

On 03/26/2018 03:15 PM, Linus Torvalds wrote:
> Secretly, I was hoping to kill x32, because it's not being used afaik.
FWIW, we are maintaining an x32 port in Debian and there are some people
actually using it [1]. There is one build instance running on VMWare that
I am hosting [2] and around 10800 out of 12900 source packages build fine
on x32 (12900 being the number for x86_64).

The port is mostly stable but the fact that it's a 32-bit target with a
64-bit kernel API often blows up in people's faces because they don't
expect things like a 64-bit time_t on a 32-bit system.

The port also has some issues with software unaware of the x32 and builds
fail when they just test for __x86_64__ but not for __ILP32__, but overall
it's usable and stable and has some performance advantages over x86_64.

Adrian

> [1] http://debian-x32.org/
> [2] https://buildd.debian.org/status/architecture.php?a=x32&suite=sid

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913