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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B3705C4332F for ; Tue, 15 Nov 2022 11:21:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229942AbiKOLVH (ORCPT ); Tue, 15 Nov 2022 06:21:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58582 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238287AbiKOLUo (ORCPT ); Tue, 15 Nov 2022 06:20:44 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1F86AB1D7; Tue, 15 Nov 2022 03:20:42 -0800 (PST) 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> Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org 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.