Received: by 10.223.176.5 with SMTP id f5csp480300wra; Sat, 3 Feb 2018 03:46:31 -0800 (PST) X-Google-Smtp-Source: AH8x226OKW9AFfWAt16feUosBrqkgDtdxkLxrSpGJgIEs6FISKwN81H53WY8LPOiWDRsEtNzj25G X-Received: by 2002:a17:902:be15:: with SMTP id r21-v6mr17502186pls.361.1517658391155; Sat, 03 Feb 2018 03:46:31 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1517658391; cv=none; d=google.com; s=arc-20160816; b=0jNWG+s0PgSNGihZHJkNTU4ezMSDsP/9I2vHpS0krSzh0yL8mjucBZwtM6/6TYnRqR fY1rUEwTfBi3eHCsxuioJHSLRcKDJ0KSGyI8Sfv0mYVKOysNNHDQGQ29AHTXesGWSgYi 53UINGwKZDeevjmdMq5jENpm8Av5ghbgzFNtTr+LVSEnL89TYDOBf9U+h9kY2ek0BTZU PJuwx/BVNjY3Sg9yxwSNieN6A0dwmEcL5Ik6rGP6QMZaQIlu9a2pH91vYCL8Vkq9Whq7 bJ+3R2OhHUTkJMdKk3k0N6OlhX09ogRxBLnAh55U20XFtHC/EssXDkXnCH212GKMUccY ZE9g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:dkim-signature:arc-authentication-results; bh=+lNJyXIYJGrM4dilRxPuxMDfGH5EgnLxEu/61BoyyJk=; b=OYAqFrXbOSaACSzTuaMM+Vig+cFfZV10aYW7E9PEXDI/sKEc/LcEjJ99bC9JM/64T4 SlOeNwLhsXC9VEUqLA/oKclDgE5S1y6y5qbxMRNs80w9hCav1fobpTwvBQMiY4s+NiLT favj30JLyP3+dQ00Z1CIc9AyBr9Cg4aj85Lz/BO3SY40CYGVHsZVm2duzqr5Kqy1g2O0 JGHtCwirtCuWpSpgDt0Sz414GO8xLO/2OkWdxeTaRAjJQ95jHTEOv+FkH5rFNzIWlYgK 0FploRbGTsS/c5PGvuZ7vap6IrtWH9VeCepYVL+CtRORQUc7YTzsry3mB1ZMQJNXm1dG lldQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=merlin.20170209 header.b=j6QVdZSK; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id u6-v6si3563553plm.382.2018.02.03.03.46.16; Sat, 03 Feb 2018 03:46:31 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=merlin.20170209 header.b=j6QVdZSK; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752237AbeBCLoX (ORCPT + 99 others); Sat, 3 Feb 2018 06:44:23 -0500 Received: from merlin.infradead.org ([205.233.59.134]:39234 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751617AbeBCLoQ (ORCPT ); Sat, 3 Feb 2018 06:44:16 -0500 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=+lNJyXIYJGrM4dilRxPuxMDfGH5EgnLxEu/61BoyyJk=; b=j6QVdZSKfJ9qEjCoJOQ7SUbBn bXothqXl0/iXGEYBwirx9XpwksP/Dh93xQjuCp5kephHJqTKFAdoQcO4k9cecsdBOqkTYgOW3eBk1 hv9iIUzLuXHMxsz71qWUs3zYkhyJWHJnGDa5WDVLJc22PppjwGK+dtoF8aN82uZKgvMn7WM4S67aw jAMnm0Li3/zSgzosWvZpcgB+v+ZWEhEUnhKmWvxXDQbqp7HkaTk+oT9ViJbWB+pNA2NGuzg2UyMrO ChvmpvU0Zg6Qkdn6JrelxGrZDmT4SKt5T7OEIi9dJrUyBCz5x//sd1UCtAGy/dsS+RE37yYoKy9qE LQ0krUsaA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1ehwEf-0003QW-Fc; Sat, 03 Feb 2018 11:43:57 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 20C582029F9F9; Sat, 3 Feb 2018 12:43:56 +0100 (CET) Date: Sat, 3 Feb 2018 12:43:56 +0100 From: Peter Zijlstra To: kbuild test robot Cc: kbuild-all@01.org, Stafford Horne , Will Deacon , Paul McKenney , Jonas Bonn , Stefan Kristiansson , David Howells , Arnd Bergmann , linux-kernel@vger.kernel.org, Thomas Gleixner Subject: Re: asm-generic: Disallow no-op mb() for SMP systems Message-ID: <20180203114356.GV2269@hirez.programming.kicks-ass.net> References: <20180131130034.GR2269@hirez.programming.kicks-ass.net> <201802030203.kIXRmGUe%fengguang.wu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201802030203.kIXRmGUe%fengguang.wu@intel.com> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Feb 03, 2018 at 03:14:01AM +0800, kbuild test robot wrote: > Hi Peter, > > I love your patch! Yet something to improve: > > [auto build test ERROR on asm-generic/master] > [also build test ERROR on v4.15 next-20180202] > [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] > > url: https://github.com/0day-ci/linux/commits/Peter-Zijlstra/asm-generic-Disallow-no-op-mb-for-SMP-systems/20180203-000108 > base: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master > config: mn10300-asb2364_defconfig (attached as .config) > compiler: am33_2.0-linux-gcc (GCC) 7.2.0 David, this one is yours :-) Does that mn10300 thing really have sequentially consistent SMP (no store buffers or anything?)