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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 F03B1C433DF for ; Wed, 8 Jul 2020 18:20:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C7A82206F6 for ; Wed, 8 Jul 2020 18:20:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594232438; bh=TonelHlHtWDNOIWLPcZdK8GZofB+N27b/F2Vm9vTRh8=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=gtDLPV9Gh8UtEvs+8cSh3e6vhVNagITa+BE8L9u72G1TBCJHHddqbk0nEPaS9ebGk /66jKeFm7XR358n5u4Gap83P7CBjytFiB/sxKQ1Sh1sUhpE6BMNBHjaEiCIcvGLYaI +76/k70uBa17fB9JS1uM+ALA/B4YZecgn51bk1ko= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726480AbgGHSUh (ORCPT ); Wed, 8 Jul 2020 14:20:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:42244 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725949AbgGHSUh (ORCPT ); Wed, 8 Jul 2020 14:20:37 -0400 Received: from paulmck-ThinkPad-P72.home (50-39-111-31.bvtn.or.frontiernet.net [50.39.111.31]) (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 84B4720658; Wed, 8 Jul 2020 18:20:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594232436; bh=TonelHlHtWDNOIWLPcZdK8GZofB+N27b/F2Vm9vTRh8=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=ukj3cLrdjnebjlAukmmTASRyw1pa2gMozxAYVE8k3Aal5uTo6H7tEBiy5eJN+QxXL gRJwrI65r1HmPmI3ecywXxV/5VkFMVuEu4tbgwYCZmqCvbTsSU6mGg/xNvJwWULf34 9NfF2Ngood+DO+fV+U5vOrrqOFGolG0eKpdqBV2Q= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 503CE3522635; Wed, 8 Jul 2020 11:20:36 -0700 (PDT) Date: Wed, 8 Jul 2020 11:20:36 -0700 From: "Paul E. McKenney" To: Peter Zijlstra Cc: Nick Desaulniers , Dave Martin , Will Deacon , Sami Tolvanen , Marco Elver , Mark Rutland , "Michael S. Tsirkin" , Catalin Marinas , Jason Wang , virtualization@lists.linux-foundation.org, Alan Stern , Matt Turner , kernel-team , Kees Cook , Arnd Bergmann , Boqun Feng , Josh Triplett , Ivan Kokshaysky , Linux ARM , Richard Henderson , LKML , linux-alpha@vger.kernel.org, Steven Rostedt Subject: Re: [PATCH 18/18] arm64: lto: Strengthen READ_ONCE() to acquire when CLANG_LTO=y Message-ID: <20200708182036.GR9247@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20200701170722.4rte5ssnmrn2uqzg@bakewell.cambridge.arm.com> <20200702072301.GA15963@willie-the-truck> <20200706160023.GB10992@arm.com> <20200706163455.GV9247@paulmck-ThinkPad-P72> <20200706170556.GE10992@arm.com> <20200706173628.GZ9247@paulmck-ThinkPad-P72> <20200707102915.GI10992@arm.com> <20200707225122.GJ9247@paulmck-ThinkPad-P72> <20200708091620.GF597537@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200708091620.GF597537@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 08, 2020 at 11:16:20AM +0200, Peter Zijlstra wrote: > On Tue, Jul 07, 2020 at 04:01:28PM -0700, Nick Desaulniers wrote: > > I'm trying to put together a Micro Conference for Linux Plumbers > > conference focused on "make LLVM slightly less shitty." Do you all > > plan on attending the conference? Would it be worthwhile to hold a > > session focused on discussing this (LTO and memory models) be > > worthwhile? > > I'd love to have a session about compilers and memory ordering with both > GCC and CLANG in attendance. > > We need a solution for dependent-loads and control-dependencies for both > toolchains. What Peter said! ;-) Thanx, Paul