linux-kernel - Re: Cleaning up numbering for new x86 syscalls?

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Date:   Wed, 21 Nov 2018 00:04:34 +0100
From:   Bernd Petrovitsch <bernd@...rovitsch.priv.at>
To:     Ingo Molnar <mingo@...nel.org>, Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Tycho Andersen <tycho@...ho.ws>,
        Daniel Colascione <dancol@...gle.com>,
        Florian Weimer <fweimer@...hat.com>,
        "Carlos O'Donell" <carlos@...hat.com>,
        Rich Felker <dalias@...c.org>
Subject: Re: Cleaning up numbering for new x86 syscalls?

On 20/11/2018 08:33, Ingo Molnar wrote:
[...]
> 6. Is x32 even used in practice? I still think it was a mistake to add it 
>    and some significant distributions like Fedora are not enabling it.

x32 works as far as gcc/gas/ld is concerned (at least for compiling
non-trivial programs).
Finding a distribution that actually *delivers* x32 libraries is another
thing (and said non-trivial software uses ATM e.g. libxml2) - at least I
can't find an "x32-Ubuntu".
And no, I don't see a compelling reason to (try to) build the n+1.
architecture for the major distributions.
And yes, lots of stuff will not compile out of the box (especially if
one uses a somewhat sane set of gcc options - not only -Wall -Wextra
-Werror) but if one gets software to compile for i386 and x86_64,
getting it to compile for x32 is a Friday afternoon job (more or less).
And yes, there is enough hardware/systems out there that uses 64bit CPUs
(for whatever reason - if only that one can't get a 32bit CPU for that
board) but will never ever need more than 2-3 GB RAM .....

MfG,
	Bernd
-- 
Bernd Petrovitsch                  Email : bernd@...rovitsch.priv.at
                     LUGA : http://www.luga.at