From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41C76C04EB8 for ; Tue, 11 Dec 2018 02:24:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 07FF62064D for ; Tue, 11 Dec 2018 02:24:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 07FF62064D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zytor.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729637AbeLKCYV convert rfc822-to-8bit (ORCPT ); Mon, 10 Dec 2018 21:24:21 -0500 Received: from terminus.zytor.com ([198.137.202.136]:42683 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727485AbeLKCYU (ORCPT ); Mon, 10 Dec 2018 21:24:20 -0500 Received: from wld62.hos.anvin.org (c-24-5-245-234.hsd1.ca.comcast.net [24.5.245.234] (may be forged)) (authenticated bits=0) by mail.zytor.com (8.15.2/8.15.2) with ESMTPSA id wBB2N3nv3634698 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO); Mon, 10 Dec 2018 18:23:04 -0800 Date: Mon, 10 Dec 2018 18:22:56 -0800 User-Agent: K-9 Mail for Android In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Subject: Re: Can we drop upstream Linux x32 support? To: Linus Torvalds , Andrew Lutomirski CC: the arch/x86 maintainers , Linux List Kernel Mailing , linux-api@vger.kernel.org, Peter Zijlstra , bp@alien8.de, fweimer@redhat.com, vapier@gentoo.org, hjl.tools@gmail.com, dalias@libc.org, x32@buildd.debian.org, Arnd Bergmann , Will Deacon , Catalin Marinas From: hpa@zytor.com Message-ID: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On December 10, 2018 5:40:33 PM PST, Linus Torvalds wrote: >On Mon, Dec 10, 2018 at 5:23 PM Andy Lutomirski >wrote: >> >> I'm seriously considering sending a patch to remove x32 support from >> upstream Linux. Here are some problems with it: > >I talked to Arnd (I think - we were talking about all the crazy ABI's, >but maybe it was with somebody else) about exactly this in Edinburgh. > >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. > >I'm not opposed to trying to sunset the support, but let's see who >complains.. > > Linus The use case aside, I need to address the technical issues in this post; some of the behaviors that Andy is pointing out area quite intentional, even if they are perhaps somewhat confusing at first glance. That being said, some were due to tradeoffs that might have been wrong. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.