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 709A5C3F2CE for ; Fri, 6 Mar 2020 03:44:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 46AFB20848 for ; Fri, 6 Mar 2020 03:44:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583466253; bh=LefwvxIBpcgDkUuII0S/6ZNAIAh8S5CPv6c9pW7foWk=; h=Subject:To:Cc:References:From:Date:In-Reply-To:List-ID:From; b=Mdd0MBEVQLd9ovO62Oo2KKxIOlnS6/8p6bESZBm524ShoZzME6eaebq/hdSCkvjZ7 Rsjnx1StZ9nNMwwBcg+t1v5SQOwj184gHR0+FrWUBzdimcZo1TQG7tv1QpAqQ8bWvH zv9R0LekNF64Cc1SerNVjTjF1kaiBppGkx6XeW0k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727123AbgCFDoM (ORCPT ); Thu, 5 Mar 2020 22:44:12 -0500 Received: from mail.kernel.org ([198.145.29.99]:34388 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726317AbgCFDoL (ORCPT ); Thu, 5 Mar 2020 22:44:11 -0500 Received: from [192.168.1.74] (75-58-59-55.lightspeed.rlghnc.sbcglobal.net [75.58.59.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1C5DC2072D; Fri, 6 Mar 2020 03:44:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583466251; bh=LefwvxIBpcgDkUuII0S/6ZNAIAh8S5CPv6c9pW7foWk=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=pnYJLxBsg3kgxIIltlnzjm59zE9NAfTNOwWEpDEwnD13OJ5LQw/18xps2jKdCPjlc T6FJpo2I2+x6ysh1UJOnKm3N3gRXwOoRzz3kATGKFy8oe/CxrxwtQ854S6Ic4aju8y w1shkzNdaUFxc7GeZTMCSV2qsgtY1UpBeGMNBUvU= Subject: Re: About commit "io: change inX() to have their own IO barrier overrides" To: Arnd Bergmann , John Garry Cc: "xuwei (O)" , Bjorn Helgaas , "linux-kernel@vger.kernel.org" , Jiaxun Yang , linux-arch , Linux ARM , Will Deacon , Catalin Marinas References: <2e80d7bc-32a0-cc40-00a9-8a383a1966c2@huawei.com> <8207cd51-5b94-2f15-de9f-d85c9c385bca@huawei.com> <6115fa56-a471-1e9f-edbb-e643fa4e7e11@kernel.org> <7c955142-1fcb-d99e-69e4-1e0d3d9eb8c3@huawei.com> From: Sinan Kaya Autocrypt: addr=okaya@kernel.org; keydata= mQENBFrnOrUBCADGOL0kF21B6ogpOkuYvz6bUjO7NU99PKhXx1MfK/AzK+SFgxJF7dMluoF6 uT47bU7zb7HqACH6itTgSSiJeSoq86jYoq5s4JOyaj0/18Hf3/YBah7AOuwk6LtV3EftQIhw 9vXqCnBwP/nID6PQ685zl3vH68yzF6FVNwbDagxUz/gMiQh7scHvVCjiqkJ+qu/36JgtTYYw 8lGWRcto6gr0eTF8Wd8f81wspmUHGsFdN/xPsZPKMw6/on9oOj3AidcR3P9EdLY4qQyjvcNC V9cL9b5I/Ud9ghPwW4QkM7uhYqQDyh3SwgEFudc+/RsDuxjVlg9CFnGhS0nPXR89SaQZABEB AAG0HVNpbmFuIEtheWEgPG9rYXlhQGtlcm5lbC5vcmc+iQFOBBMBCAA4FiEEYdOlMSE+a7/c ckrQvGF4I+4LAFcFAlztcAoCGwMFCwkIBwIGFQoJCAsCBBYCAwECHgECF4AACgkQvGF4I+4L AFfidAf/VKHInxep0Z96iYkIq42432HTZUrxNzG9IWk4HN7c3vTJKv2W+b9pgvBF1SmkyQSy 8SJ3Zd98CO6FOHA1FigFyZahVsme+T0GsS3/OF1kjrtMktoREr8t0rK0yKpCTYVdlkHadxmR Qs5xLzW1RqKlrNigKHI2yhgpMwrpzS+67F1biT41227sqFzW9urEl/jqGJXaB6GV+SRKSHN+ ubWXgE1NkmfAMeyJPKojNT7ReL6eh3BNB/Xh1vQJew+AE50EP7o36UXghoUktnx6cTkge0ZS qgxuhN33cCOU36pWQhPqVSlLTZQJVxuCmlaHbYWvye7bBOhmiuNKhOzb3FcgT7kBDQRa5zq1 AQgAyRq/7JZKOyB8wRx6fHE0nb31P75kCnL3oE+smKW/sOcIQDV3C7mZKLf472MWB1xdr4Tm eXeL/wT0QHapLn5M5wWghC80YvjjdolHnlq9QlYVtvl1ocAC28y43tKJfklhHiwMNDJfdZbw 9lQ2h+7nccFWASNUu9cqZOABLvJcgLnfdDpnSzOye09VVlKr3NHgRyRZa7me/oFJCxrJlKAl 2hllRLt0yV08o7i14+qmvxI2EKLX9zJfJ2rGWLTVe3EJBnCsQPDzAUVYSnTtqELu2AGzvDiM gatRaosnzhvvEK+kCuXuCuZlRWP7pWSHqFFuYq596RRG5hNGLbmVFZrCxQARAQABiQEfBBgB CAAJBQJa5zq1AhsMAAoJELxheCPuCwBX2UYH/2kkMC4mImvoClrmcMsNGijcZHdDlz8NFfCI gSb3NHkarnA7uAg8KJuaHUwBMk3kBhv2BGPLcmAknzBIehbZ284W7u3DT9o1Y5g+LDyx8RIi e7pnMcC+bE2IJExCVf2p3PB1tDBBdLEYJoyFz/XpdDjZ8aVls/pIyrq+mqo5LuuhWfZzPPec 9EiM2eXpJw+Rz+vKjSt1YIhg46YbdZrDM2FGrt9ve3YaM5H0lzJgq/JQPKFdbd5MB0X37Qc+ 2m/A9u9SFnOovA42DgXUyC2cSbIJdPWOK9PnzfXqF3sX9Aol2eLUmQuLpThJtq5EHu6FzJ7Y L+s0nPaNMKwv/Xhhm6Y= Message-ID: <90af535f-00ef-c1e3-ec20-aae2bd2a0d88@kernel.org> Date: Thu, 5 Mar 2020 22:44:08 -0500 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/3/2020 11:40 AM, Arnd Bergmann wrote: >> - ret = read##bw(PCI_IOBASE + addr); >> + __io_pbr(); >> + ret = __raw_read##bw(PCI_IOBASE + addr); >> + __io_pbr(); > __io_par(); > Why do we need to change read##bw above? read##bw already provides strong ordering guarantees across multiple architectures.