linux-kernel - Re: Can we drop upstream Linux x32 support?

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Message-ID: <871s6o32d6.fsf@oldenburg2.str.redhat.com>
Date:   Tue, 11 Dec 2018 09:16:05 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andrew Lutomirski <luto@...nel.org>,
        "the arch\/x86 maintainers" <x86@...nel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org, Peter Anvin <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>, bp@...en8.de,
        vapier@...too.org, hjl.tools@...il.com, dalias@...c.org,
        x32@...ldd.debian.org, Arnd Bergmann <arnd@...db.de>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: Can we drop upstream Linux x32 support?

* Linus Torvalds:

> Apparently the main real use case is for extreme benchmarking. It's
> the only use-case where the complexity of maintaining a whole
> development environment and distro is worth it, it seems. Apparently a
> number of Spec submissions have been done with the x32 model.

Are you sure GCC was used for that?

ICC has a 32-bit pointer mode which does not change the (64-bit) kernel
interface.

Thanks,
Florian