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=-2.1 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_MUTT 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 CE894EB92A8 for ; Thu, 12 Jul 2018 18:34:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 887952124D for ; Thu, 12 Jul 2018 18:34:09 +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="2C1IxkgR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 887952124D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732228AbeGLSow (ORCPT ); Thu, 12 Jul 2018 14:44:52 -0400 Received: from merlin.infradead.org ([205.233.59.134]:49134 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726550AbeGLSow (ORCPT ); Thu, 12 Jul 2018 14:44:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=aT8wYNcncZsNjp+4/8xdzZbChni5paeFTIqYph7B6r4=; b=2C1IxkgRUp3nLV8laoJIgiwyE fCuWodpMeU92cn1OFiPs2k+m40U5ATy9zUy6I2ayhjHIt8RuqnVxb9VuXWmfyvgILyYXsS/Q4QjJW WS/XlL/FOlgP3p7mKUd5DjzW+W9BGK6D6ZkNMvSFcn148MGoDVtbHzpmairoxQvDiv3lVzsil98An B3kqTkSEpk2lhDEdlzr8iKqm9UTYv7SGhCTQ4hM9U6EWIKEuAzrQzy3o3llB+vQn2cY6dEXhSt0XG Yk0MmdUTcdF14BtLSh8/iXPxhvN82JZIZC1QsVG1A20lQXrTvrVteb10NharJIBA5iTesAnQPn+bb VPxCGrudA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fdgPS-0005XS-OQ; Thu, 12 Jul 2018 18:33:47 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 339AE20289331; Thu, 12 Jul 2018 20:33:44 +0200 (CEST) Date: Thu, 12 Jul 2018 20:33:44 +0200 From: Peter Zijlstra To: Alan Stern Cc: Andrea Parri , Will Deacon , "Paul E. McKenney" , LKMM Maintainers -- Akira Yokosawa , Boqun Feng , Daniel Lustig , David Howells , Jade Alglave , Luc Maranget , Nicholas Piggin , Kernel development list , Linus Torvalds Subject: Re: [PATCH v2] tools/memory-model: Add extra ordering for locks and remove it for ordinary release/acquire Message-ID: <20180712183344.GQ2476@hirez.programming.kicks-ass.net> References: <20180712134821.GT2494@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 12, 2018 at 01:04:27PM -0400, Alan Stern wrote: > Which raises the question of whether RCtso (adopting Daniel's suggested > term) is also too subtle or counter-intuitive for spinlocks. IMO yes, RCtso also sucks :-) But in my 'fight' for RCsc it disallows RCpc and captures the current state of affairs more accurately.