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=-11.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 E6D05C2D0A3 for ; Fri, 6 Nov 2020 19:11:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 852C820B80 for ; Fri, 6 Nov 2020 19:11:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604689909; bh=e9go00OPM1UzmcwI9P1HigeeZ+n07Z6Qs6e/rNp0WL4=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=gNPwI/lJa0f4PskvDHwGaeEY7bM/Le6bgXl2D5Tuhu1sQozJ3bCyi7F0ISeI/9i22 S1WXIloZZ3ogsgntR4achw+OKcE/NT7bS5JpXvbh6k5RIFt25OIO9jDEtvEJRNNtLA Fn6GUPUvCBObehlxEreytDYKBKPEvdY2STB6nyeM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727771AbgKFTLt (ORCPT ); Fri, 6 Nov 2020 14:11:49 -0500 Received: from mail.kernel.org ([198.145.29.99]:57424 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727257AbgKFTLt (ORCPT ); Fri, 6 Nov 2020 14:11:49 -0500 Received: from paulmck-ThinkPad-P72.home (50-39-104-11.bvtn.or.frontiernet.net [50.39.104.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1D6BE20882; Fri, 6 Nov 2020 19:11:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604689908; bh=e9go00OPM1UzmcwI9P1HigeeZ+n07Z6Qs6e/rNp0WL4=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=Ql+d1620nolPyv30ofEW4z95xWVHKap8Ay9fFXMHQ/G/GCznnJUbAExvq2JYVhZ8+ OUJmy80KnbcOBsR4kxKimQ4HJEwXPVMGtA3Zpq35PVFyKgXH/7zbHPzsDgWLjJFxe4 qlAa8ueRVGaYIL5XzcqBXLOX56KIQnjLwGEm8YRk= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id AECDF352097B; Fri, 6 Nov 2020 11:11:47 -0800 (PST) Date: Fri, 6 Nov 2020 11:11:47 -0800 From: "Paul E. McKenney" To: Alan Stern Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, parri.andrea@gmail.com, will@kernel.org, peterz@infradead.org, boqun.feng@gmail.com, npiggin@gmail.com, dhowells@redhat.com, j.alglave@ucl.ac.uk, luc.maranget@inria.fr, akiyks@gmail.com Subject: Re: [PATCH memory-model 3/8] tools/memory-model: Document categories of ordering primitives Message-ID: <20201106191147.GY3249@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20201105215953.GA15309@paulmck-ThinkPad-P72> <20201105220017.15410-3-paulmck@kernel.org> <20201106165654.GB47039@rowland.harvard.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201106165654.GB47039@rowland.harvard.edu> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Fri, Nov 06, 2020 at 11:56:54AM -0500, Alan Stern wrote: > On Thu, Nov 05, 2020 at 02:00:12PM -0800, paulmck@kernel.org wrote: > > From: "Paul E. McKenney" > > > > The Linux kernel has a number of categories of ordering primitives, which > > are recorded in the LKMM implementation and hinted at by cheatsheet.txt. > > But there is no overview of these categories, and such an overview > > is needed in order to understand multithreaded LKMM litmus tests. > > This commit therefore adds an ordering.txt as well as extracting a > > control-dependencies.txt from memory-barriers.txt. It also updates the > > README file. > > > > [ paulmck: Apply Akira Yokosawa file-placement feedback. ] > > [ paulmck: Apply Alan Stern feedback. ] > > [ paulmck: Apply self-review feedback. ] > > Signed-off-by: Paul E. McKenney > > --- > > diff --git a/tools/memory-model/Documentation/README b/tools/memory-model/Documentation/README > > index 2d9539f..a50ea81 100644 > > --- a/tools/memory-model/Documentation/README > > +++ b/tools/memory-model/Documentation/README > > > @@ -41,13 +50,21 @@ README > > cheatsheet.txt > > Quick-reference guide to the Linux-kernel memory model. > > > > +control-dependencies.txt > > + Guide to preventing compiler optimizations from destroying > > + your control dependencies. > > + > > explanation.txt > > - Detailed description of the memory model. > > + Detailed description of the memory model in detail. > > A redundantly redundant change. I will revert the reversion of the removal of the added detail "in detail". ;-) Good catch, thank you! Thanx, Paul