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=-3.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 B125DC433E6 for ; Mon, 20 Jul 2020 16:49:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D8E020773 for ; Mon, 20 Jul 2020 16:49:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="jKU73cfB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389179AbgGTQtR (ORCPT ); Mon, 20 Jul 2020 12:49:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49696 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728890AbgGTQtQ (ORCPT ); Mon, 20 Jul 2020 12:49:16 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37E71C061794; Mon, 20 Jul 2020 09:49:16 -0700 (PDT) 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=SMaxWhwAegvetyWQHJzr2iSeRVKWInsDa9ht3IdzAJE=; b=jKU73cfBY8hjKJ+jOGtnVQYdiv tpvcuG2saC1Mh+jzmMArY69tlNIb76Mftum0Mz3M04j3/+Qr+wlSczz+gksG807GoB8HOjv+3wwK2 TL8uf++3Gm+lglg6jrlEDt0yTtIkrQzJWlOkqkvM0joh5Zh9yCq1/wd+tp7XaqVHz+ZprcVsqOKZe d4MrIAIWZGHJ89JsjqjdYwn/tSmQrcLOKiOsoFZdmi8evTDiLOUM8wO59BXAPgsrHsl1tuEIf97ux MIUaF4Kauhrk3/f4UJkMKxkuzFigWbGZRelDsf8GLxFdtfp+WLKTI6a4pE5WQ4kyIEIF/E59O471y hhqqbiGQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jxYyD-00048y-Kj; Mon, 20 Jul 2020 16:48:54 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id DFB43307A6B; Mon, 20 Jul 2020 18:48:50 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id CE8C723426BA2; Mon, 20 Jul 2020 18:48:50 +0200 (CEST) Date: Mon, 20 Jul 2020 18:48:50 +0200 From: peterz@infradead.org To: "Paul E. McKenney" Cc: Matthew Wilcox , Alan Stern , Dave Chinner , Eric Biggers , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, Akira Yokosawa , Andrea Parri , Boqun Feng , Daniel Lustig , "Darrick J . Wong" , David Howells , Jade Alglave , Luc Maranget , Nicholas Piggin , Will Deacon Subject: Re: [PATCH] tools/memory-model: document the "one-time init" pattern Message-ID: <20200720164850.GF119549@hirez.programming.kicks-ass.net> References: <20200717044427.68747-1-ebiggers@kernel.org> <20200718014204.GN5369@dread.disaster.area> <20200718140811.GA1179836@rowland.harvard.edu> <20200720013320.GP5369@dread.disaster.area> <20200720145211.GC1228057@rowland.harvard.edu> <20200720153911.GX12769@casper.infradead.org> <20200720160433.GQ9247@paulmck-ThinkPad-P72> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200720160433.GQ9247@paulmck-ThinkPad-P72> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Archived-At: List-Archive: List-Post: On Mon, Jul 20, 2020 at 09:04:34AM -0700, Paul E. McKenney wrote: > 2. If we were to say "unlock" instead of "release", consistency > would demand that we also say "lock" instead of "acquire". > But "lock" is subtlely different than "acquire", and there is > a history of people requesting further divergence. This, acquire/release are RCpc, while (with the exception of Power) LOCK/UNLOCK are RCsc. ( Or did we settle on RCtso for our release/acquire order? I have vague memories of a long-ish thread, but seem to have forgotten the outcome, if any. ) Lots of subtlety and head-aches right about there. Anyway, it would be awesome if we can get Power into the RCsc locking camp :-)