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

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Date:   Mon, 26 Mar 2018 15:03:54 -1000
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     Al Viro <viro@...iv.linux.org.uk>, 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

On Sun, Mar 25, 2018 at 8:44 PM, John Paul Adrian Glaubitz
<glaubitz@...sik.fu-berlin.de> wrote:
<
> 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).

Hmm. Do you have a few statically built binaries that could be tested
without installing a whole distribution? Something real and meaningful
enough that it actually exercised a few real system calls, but not
something that needs to bring in 50 different shared libraries?

Something in /sbin, perhaps, that is still runnable by a regular user
and doesn't require some distro-specific /etc layout etc, so that it
would work even if you don't run Debian at all? Maybe some shell
binary or something?

      Linus