Received: by 2002:ac0:a5a7:0:0:0:0:0 with SMTP id m36-v6csp5407142imm;
        Tue, 31 Jul 2018 10:21:43 -0700 (PDT)
X-Google-Smtp-Source: AAOMgpeyMWrn9mEOKa2KRxjSKElLcvh/jl4V73NiOigHPm2Qqt6PMJXcAbk8VnT+1+VjTLVYzOtZ
X-Received: by 2002:a63:b705:: with SMTP id t5-v6mr21595663pgf.45.1533057703224;
        Tue, 31 Jul 2018 10:21:43 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1533057703; cv=none;
        d=google.com; s=arc-20160816;
        b=NVJLCEG7pqh+9iBkS0h8zZIKy4f+2sz9dFomHevUjdmGhSO+E89dTrX4FwUABXiZgv
         vqupR3Yv5AcRirW1wKeLTDKCqdXJQ22zqNX4I4PEGp2jUP4oMSmrzqsE7iwYUi49HRg9
         3p/5jj4Zq7Exnz8lQpRWMnjldu6GnVliEqwpHyIPyTRnWCTF6F0z4IUFKbEj+KnwN/gN
         wgMc2MPEMn61f/M+5vJw/gUiy9CL5d42x2bjPK1XyHdBNMPdEF6OwFcdI7Cf6t70l4tc
         bswSJqUPEXrmEHyK85p3rXfSjJZP9dLwd5XTWzxhXIPPWso+909Gg6yZIz0LOUbctlmG
         QGQg==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=list-id:precedence:sender:message-id:date:subject:cc:to:from
         :dkim-signature:arc-authentication-results;
        bh=4bbQJLEk+Yv/+9YLqko8+/BHk7PnNApUvBBAbS/hd8A=;
        b=sDTHgLSzgSr2hBTVtJKphPzmpfUQqf9U3MH0kglXwCRdpT3NVFtIpDyTsFKGC/6+Sg
         d1/11YgrzNf1XLmFi5MPqD+OvPytPLtn6KCnDs8la6OSJR0YaPnINieu71SqSWxoSzUo
         woNgfDU44Hm1DvtfCSqz9LTLkc1rw8yo+aj4FQ3ocfSM6vm578R1gJm1ETCi8Kh25hGF
         udXg6vVzCVKiyHlYRMCLN1vcYbK8MqBe5q0O7IgkRfNFratqwITsqfx1nQv8DvreO2Z2
         zepuQm+EbmuOWmicZ8wbPyTnpXthECyetyx5EzQ7b5dg7cb9YR/qoZRqnAAbZuP5W1U4
         5jkw==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=MjVKjjSa;
       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: <linux-kernel-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67])
        by mx.google.com with ESMTP id 186-v6si14827729pff.270.2018.07.31.10.21.27;
        Tue, 31 Jul 2018 10:21:43 -0700 (PDT)
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=bombadil.20170209 header.b=MjVKjjSa;
       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 S1730017AbeGaTBz (ORCPT <rfc822;hackukernel@gmail.com>
        + 99 others); Tue, 31 Jul 2018 15:01:55 -0400
Received: from bombadil.infradead.org ([198.137.202.133]:46346 "EHLO
        bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1729636AbeGaTBz (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 31 Jul 2018 15:01:55 -0400
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
        d=infradead.org; s=bombadil.20170209; h=Message-Id:Date:Subject:Cc:To:From:
        Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:
        Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender:
        Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id:
        List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive;
         bh=4bbQJLEk+Yv/+9YLqko8+/BHk7PnNApUvBBAbS/hd8A=; b=MjVKjjSaxOEKA7fJvYzQ6nUnW
        Gkjs/2yR66HUDz7c53jCMd5kV0nBl3rfDsFxVEkEAqCCKr9l6zupwKPDdpKzCZeS2utrcVhdczccR
        uyPVk94DOudexnLd2KINLJhoA41vAXZzFnH4ANxVzmZUZ49jw3MlB7WQ7+iyGQF3lz1BSYGwvhYsJ
        ucEVPAGpTAYMzWSaeTlx+Y73TxUroQ9XMqJq/FJ2Ibi8ogCwY6PFfefXLpasU6ilmS4RoszhQQpKw
        mZTy1JJMwczxH4e0MwVMLC7N4SdIiYr6lOi5iOHp/2iTkdiM101x6AtVQxp0j/u9IIM1/k0cm7hpI
        bFFcyS/uw==;
Received: from 089144203113.atnat0012.highway.a1.net ([89.144.203.113] helo=localhost)
        by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux))
        id 1fkYK2-0002I9-Rz; Tue, 31 Jul 2018 17:20:35 +0000
From:   Christoph Hellwig <hch@lst.de>
To:     Tony Luck <tony.luck@intel.com>, Fenghua Yu <fenghua.yu@intel.com>
Cc:     Sinan Kaya <okaya@codeaurora.org>, Arnd Bergmann <arnd@arndb.de>,
        linux-ia64@vger.kernel.org, linux-arch@vger.kernel.org,
        linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org
Subject: barriers vs I/O and DMA for ia64
Date:   Tue, 31 Jul 2018 19:20:30 +0200
Message-Id: <20180731172031.4447-1-hch@lst.de>
X-Mailer: git-send-email 2.18.0
X-SRS-Rewrite: SMTP reverse-path rewritten from <hch@infradead.org> by bombadil.infradead.org. See http://www.infradead.org/rpr.html
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hi all,

please review these patches carefully - ia64 currenly seems to be
the odd one out in terms of barrier placement for DMA and I/O and
this patch tries to resolve it.  But I don't have any IA64 hardware
nor do I know the architecture to well, so don't blindly trust me.