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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49730C4332F for ; Tue, 15 Nov 2022 11:20:27 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 655B16B0071; Tue, 15 Nov 2022 06:20:26 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 605726B0072; Tue, 15 Nov 2022 06:20:26 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4A63E6B0073; Tue, 15 Nov 2022 06:20:26 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 3A6C86B0071 for ; Tue, 15 Nov 2022 06:20:26 -0500 (EST) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id E79E580B9A for ; Tue, 15 Nov 2022 11:20:25 +0000 (UTC) X-FDA: 80135433210.15.FEBB447 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf05.hostedemail.com (Postfix) with ESMTP id B45CB100006 for ; Tue, 15 Nov 2022 11:20:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=IKl7WGQfAymNErXeKgALi5N5LamZyu9FJRTMbZB3fbk=; b=cPr8a5dnJ75U+9j9hiVNbCDxU/ SOtD/I8TC6AQJpzHrhv4V7b+WELEXn1IJQwqvbjjHzz8kTwwI/+/ocq1v5x4vV+mW+QbIUYrBdFq0 e+5/6xTytWkyIjkdijfm8sUgnDnZfQC3pLMMXdaL0NTEz+xcEfuwd8iB0oQgrEg5k/71vVmQdH21m qrkWX6IDMMsfEyNdj8dLBabslclpjezIorMiZd5KDKoID/wyxVFAB+QlRTE5yWy7VZQxuA36ara3n 2aenpDlKUaZOBs6tPMxDQQw2qckcCAVc0XLcSKGdNplGHcNRxna4I7uuDJxFVkohm9Rs6HLGOcNem inmlCEGA==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1outz8-00GTV6-Q9; Tue, 15 Nov 2022 11:20:10 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 6B509300242; Tue, 15 Nov 2022 12:20:02 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 4FA9F20162835; Tue, 15 Nov 2022 12:20:02 +0100 (CET) Date: Tue, 15 Nov 2022 12:20:02 +0100 From: Peter Zijlstra To: Rick Edgecombe Cc: x86@kernel.org, "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H . J . Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Randy Dunlap , "Ravi V . Shankar" , Weijiang Yang , "Kirill A . Shutemov" , John Allen , kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com, akpm@linux-foundation.org, Yu-cheng Yu , Peter Xu Subject: Re: [PATCH v3 13/37] mm: Move VM_UFFD_MINOR_BIT from 37 to 38 Message-ID: References: <20221104223604.29615-1-rick.p.edgecombe@intel.com> <20221104223604.29615-14-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221104223604.29615-14-rick.p.edgecombe@intel.com> ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1668511225; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=IKl7WGQfAymNErXeKgALi5N5LamZyu9FJRTMbZB3fbk=; b=qMu4PWugqCKjnnWNd6ysZeoHWcV7CwRRRbfpgOYr07qjSjRBT7rw/dLv1FRtr22TH0UWFc op7ghNP3iw7ePEuum1lq+lZJ97vrxaRIsBZYkZUJA2KHoMCoDgUJyCy/GFPlHzcNF9bB/I +V4SsCk4xhr7mIoaHQM7hO12U2P5zf0= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=cPr8a5dn; spf=none (imf05.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=peterz@infradead.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1668511225; a=rsa-sha256; cv=none; b=2f1y7edFvI/OVHqs55KA892At7HVQU7Hz7OSEbvfD1F5VJj918pT/v2imvo1Ot2UFbGPhf bOhr0glqzRPvlDdposv65bhvyKGLcIYrXcvu4F7T/tTEUXdYJ0fdk23MpmiMFqL33HTEG6 DSf7lqIn/3lvlxwpkf4PQQ4xSxqZFlw= X-Stat-Signature: 94m59fz4ug76cpnn16aq8jtjgnfbiw17 X-Rspamd-Queue-Id: B45CB100006 Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=cPr8a5dn; spf=none (imf05.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=peterz@infradead.org; dmarc=none X-Rspamd-Server: rspam07 X-Rspam-User: X-HE-Tag: 1668511224-788152 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Nov 04, 2022 at 03:35:40PM -0700, Rick Edgecombe wrote: > From: Yu-cheng Yu > > To introduce VM_SHADOW_STACK as VM_HIGH_ARCH_BIT (37), and make all > VM_HIGH_ARCH_BITs stay together, move VM_UFFD_MINOR_BIT from 37 to 38. Why thought ?!? Changelog utterly fails to provide rationale.