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=-0.6 required=3.0 tests=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 517B6C433DF for ; Wed, 8 Jul 2020 09:18:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 218F920663 for ; Wed, 8 Jul 2020 09:18:17 +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="WrCmcevb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728041AbgGHJSP (ORCPT ); Wed, 8 Jul 2020 05:18:15 -0400 Received: from casper.infradead.org ([90.155.50.34]:58470 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726144AbgGHJSP (ORCPT ); Wed, 8 Jul 2020 05:18:15 -0400 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=2Hfa1uIvYhCo4qIOtwYZRPWhHsNHPggWR4XS5g82A1A=; b=WrCmcevbzE7HgiZ8thbdqUPK1p jCodtCebSCwb0fju452gYR+f/K3Wknd4TpdkHytYxv2OyROHjC6Kl/QqjvAbIP0RIxd7AMJLvUG4R DnJwQG3JPFtxdZ+/fMFhN+WnSPj6zk1iJ4N5D5eqeNL/gp6nYJUhKN+bOfOIg4RSwQf2fvMuW53xm +2+JxS+krK6CdqMwIwuBuewB3T+PVDZxrX3K6OUNxSz19yhFtZc8kNp12Zbc2pWhwJ7181LcnV9il 3eVB3TkH4tYXj12GNXYsVln4EtOBNCIoy04XZdIg6OffdMMUsDcOzlIFiPG+cZP5suhLcdjicxrxu AeBgN9LQ==; 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 1jt6Bj-0001Xn-MO; Wed, 08 Jul 2020 09:16:27 +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 40D5730047A; Wed, 8 Jul 2020 11:16:20 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 1F114212325C9; Wed, 8 Jul 2020 11:16:20 +0200 (CEST) Date: Wed, 8 Jul 2020 11:16:20 +0200 From: Peter Zijlstra To: Nick Desaulniers Cc: "Paul E. McKenney" , 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: <20200708091620.GF597537@hirez.programming.kicks-ass.net> References: <20200630173734.14057-19-will@kernel.org> <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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: [PATCH 18/18] arm64: lto: Strengthen READ_ONCE() to acquire when CLANG_LTO=y Date: Wed, 8 Jul 2020 11:16:20 +0200 Message-ID: <20200708091620.GF597537@hirez.programming.kicks-ass.net> References: <20200630173734.14057-19-will@kernel.org> <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> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: 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=2Hfa1uIvYhCo4qIOtwYZRPWhHsNHPggWR4XS5g82A1A=; b=WrCmcevbzE7HgiZ8thbdqUPK1p jCodtCebSCwb0fju452gYR+f/K3Wknd4TpdkHytYxv2OyROHjC6Kl/QqjvAbIP0RIxd7AMJLvUG4R DnJwQG3JPFtxdZ+/fMFhN+WnSPj6zk1iJ4N5D5eqeNL/gp6nYJUhKN+bOfOIg4RSwQf2fvMuW53xm +2+JxS+krK6CdqMwIwuBuewB3T+PVDZxrX3K6OUNxSz19yhFtZc8kNp12Zbc2pWhwJ7181LcnV9il 3eVB3TkH4tYXj12GNXYsVln4EtOBNCIoy04XZdIg6OffdMMUsDcOzlIFiPG+cZP5suhLcdjicxrxu AeBgN9LQ==; Content-Disposition: inline In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" To: Nick Desaulniers Cc: Mark Rutland , "Michael S. Tsirkin" , Catalin Marinas , virtualization@lists.linux-foundation.org, Will Deacon , Arnd Bergmann , Alan Stern , Sami Tolvanen , Matt Turner , kernel-team , Dave Martin , Marco Elver , Kees Cook , "Paul E. McKenney" , Boqun Feng , Josh Triplett , Steven Rostedt , Ivan Kokshaysky , Linux ARM , Richard Henderson , LKML , linux-alpha@vger.kernel.org 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. 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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 23A30C433DF for ; Wed, 8 Jul 2020 09:18:32 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DF59E2063A for ; Wed, 8 Jul 2020 09:18:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="F3jq1/5A"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="WrCmcevb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DF59E2063A 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-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=UogXAZJpjr3TSekdxvoKJ9Uvq9wReQ1lSCiFLuLy0GU=; b=F3jq1/5AIL/eio3p0q5b35CK5 mkbkkMIfsSIJhS4j2TzhFm1tB1wv26LweYfNgzuISo3l0qU6CCxVgOLp0/Ke5GnmYk+kca+AlKR26 PwgjohnNIU8xGgeHl+MLlBjFvaOwgDC9haDe0iQfUv6DhDXDUkT34m4SGAunXsRinLxIW3X35oTZh kV7WkLSB2sBgDhj3nsh+SFO9v6tezZ9OoIMMJrdhH4J7vqMgrVO76t42KTvXCS1SEmQADigjnjw6a yVIWYPBEeZNxRVIMFxR6Vtp75/EwVkX6aKJtVtXKTzfCjZuIs1c17yCUAkyewy0vcAo/ce1aQs033 OcUKshRuA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jt6CV-0008M5-6k; Wed, 08 Jul 2020 09:17:11 +0000 Received: from casper.infradead.org ([90.155.50.34]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jt6CT-0008Lo-5c for linux-arm-kernel@merlin.infradead.org; Wed, 08 Jul 2020 09:17:09 +0000 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=2Hfa1uIvYhCo4qIOtwYZRPWhHsNHPggWR4XS5g82A1A=; b=WrCmcevbzE7HgiZ8thbdqUPK1p jCodtCebSCwb0fju452gYR+f/K3Wknd4TpdkHytYxv2OyROHjC6Kl/QqjvAbIP0RIxd7AMJLvUG4R DnJwQG3JPFtxdZ+/fMFhN+WnSPj6zk1iJ4N5D5eqeNL/gp6nYJUhKN+bOfOIg4RSwQf2fvMuW53xm +2+JxS+krK6CdqMwIwuBuewB3T+PVDZxrX3K6OUNxSz19yhFtZc8kNp12Zbc2pWhwJ7181LcnV9il 3eVB3TkH4tYXj12GNXYsVln4EtOBNCIoy04XZdIg6OffdMMUsDcOzlIFiPG+cZP5suhLcdjicxrxu AeBgN9LQ==; 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 1jt6Bj-0001Xn-MO; Wed, 08 Jul 2020 09:16:27 +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 40D5730047A; Wed, 8 Jul 2020 11:16:20 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 1F114212325C9; Wed, 8 Jul 2020 11:16:20 +0200 (CEST) Date: Wed, 8 Jul 2020 11:16:20 +0200 From: Peter Zijlstra To: Nick Desaulniers Subject: Re: [PATCH 18/18] arm64: lto: Strengthen READ_ONCE() to acquire when CLANG_LTO=y Message-ID: <20200708091620.GF597537@hirez.programming.kicks-ass.net> References: <20200630173734.14057-19-will@kernel.org> <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> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , "Michael S. Tsirkin" , Catalin Marinas , Jason Wang , virtualization@lists.linux-foundation.org, Will Deacon , Arnd Bergmann , Alan Stern , Sami Tolvanen , Matt Turner , kernel-team , Dave Martin , Marco Elver , Kees Cook , "Paul E. McKenney" , Boqun Feng , Josh Triplett , Steven Rostedt , Ivan Kokshaysky , Linux ARM , Richard Henderson , LKML , linux-alpha@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel