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=-6.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 DBAF7C46499 for ; Fri, 5 Jul 2019 18:06:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BE56920989 for ; Fri, 5 Jul 2019 18:06:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727340AbfGESGs (ORCPT ); Fri, 5 Jul 2019 14:06:48 -0400 Received: from mga18.intel.com ([134.134.136.126]:36738 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725730AbfGESGs (ORCPT ); Fri, 5 Jul 2019 14:06:48 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Jul 2019 11:06:47 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,455,1557212400"; d="scan'208";a="248236591" Received: from viggo.jf.intel.com (HELO localhost.localdomain) ([10.54.77.144]) by orsmga001.jf.intel.com with ESMTP; 05 Jul 2019 11:06:47 -0700 Subject: [PATCH 0/3] [RFC] x86: start the MPX removal process To: linux-kernel@vger.kernel.org Cc: Dave Hansen , x86@kernel.org, luto@kernel.org From: Dave Hansen Date: Fri, 05 Jul 2019 10:53:17 -0700 Message-Id: <20190705175317.1B3C9C52@viggo.jf.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org MPX requires recompiling applications, which requires compiler support. Unfortunately, GCC 9.1 is expected to be be released without support for MPX. This means that there was only a relatively small window where folks could have ever used MPX. It failed to gain wide adoption in the industry, and Linux was the only mainstream OS to ever support it widely. Support for the feature may also disappear on future processors. The benefits of keeping the feature in the tree is not worth the ongoing maintenance cost. It was a fun run, but it's time for it to go. Adios, MPX! This set starts the process, beginning with the removal of code that is unlikely to cause any collateral damage. The selftests have been causing some trouble, so they along with the APIs are first to go. This series is also available here, and will get some additional 0day testing to ensure no funkiness: git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-mpx.git mpx-remove-201907 While there's no rocket science in here, this is probably not ready to be pulled until 0day has the weekend to churn on it. Cc: x86@kernel.org Cc: Andy Lutomirski