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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no 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 BF33FC35DF5 for ; Tue, 25 Feb 2020 10:06:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8F1F821556 for ; Tue, 25 Feb 2020 10:06:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729588AbgBYKGu (ORCPT ); Tue, 25 Feb 2020 05:06:50 -0500 Received: from ms.lwn.net ([45.79.88.28]:53048 "EHLO ms.lwn.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727016AbgBYKGu (ORCPT ); Tue, 25 Feb 2020 05:06:50 -0500 Received: from localhost.localdomain (localhost [127.0.0.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ms.lwn.net (Postfix) with ESMTPSA id 85475750; Tue, 25 Feb 2020 10:06:47 +0000 (UTC) Date: Tue, 25 Feb 2020 03:06:42 -0700 From: Jonathan Corbet To: Dave Hansen Cc: Mauro Carvalho Chehab , Linux Doc Mailing List , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , x86@kernel.org, Dave Hansen Subject: Re: [PATCH 6/7] docs: remove nompx kernel parameter and intel_mpx from index.rst Message-ID: <20200225030642.0c0e84a8@lwn.net> In-Reply-To: References: <934144ad8199db837c3b21479e6966c597706dab.1582361738.git.mchehab+huawei@kernel.org> Organization: LWN.net X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Mon, 24 Feb 2020 09:30:09 -0800 Dave Hansen wrote: > On 2/22/20 1:00 AM, Mauro Carvalho Chehab wrote: > > - nompx [X86] Disables Intel Memory Protection Extensions. > > - See Documentation/x86/intel_mpx.rst for more > > - information about the feature. > > Thanks for finding this. > > But, it does make me wonder if we should remove it outright or leave a > stub reminding folks that "nompx" probably shouldn't be reused for a > while. Maybe something like: > > nompx [X86] Previously, disabled Intel Memory Protection > Extensions. Code removed in v5.6. > Is the concern that people might still be booting kernels with that option, even though it's gone? If that's the case, probably what should really happen is a check within the code to issue a warning telling those users that MPX is an ex-parrot. That would also have the effect of deterring reuse... ? Thanks, jon