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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 79040C0044D for ; Sun, 15 Mar 2020 02:56:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5652020578 for ; Sun, 15 Mar 2020 02:56:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726222AbgCOC4X (ORCPT ); Sat, 14 Mar 2020 22:56:23 -0400 Received: from m17617.mail.qiye.163.com ([59.111.176.17]:49990 "EHLO m17617.mail.qiye.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725793AbgCOC4W (ORCPT ); Sat, 14 Mar 2020 22:56:22 -0400 X-Greylist: delayed 4204 seconds by postgrey-1.27 at vger.kernel.org; Sat, 14 Mar 2020 22:56:04 EDT Received: from ubuntu.localdomain (unknown [58.251.74.227]) by m17617.mail.qiye.163.com (Hmail) with ESMTPA id C1204260FF6; Sat, 14 Mar 2020 23:07:12 +0800 (CST) From: Wang Wenhu To: Harry Wei , Alex Shi , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linux-kernel@zh-kernel.org, kernel@vivo.com, Wang Wenhu Subject: [PATCH] doc: zh_CN: fix style problems for io_ordering.txt Date: Sat, 14 Mar 2020 08:07:05 -0700 Message-Id: <20200314150706.73955-1-wenhu.wang@vivo.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZTlVIQ01CQkJNS0xLQ01KQ1lXWShZQU hPN1dZLVlBSVdZCQ4XHghZQVk1NCk2OjckKS43PlkG X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6PFE6DRw6Fjg3NDdCAyMfTDMy MitPCjNVSlVKTkNPSkJDT0hNSUtNVTMWGhIXVQweFRMOVQwaFRw7DRINFFUYFBZFWVdZEgtZQVlO Q1VJTkpVTE9VSUlMWVdZCAFZQU9NTkI3Bg++ X-HM-Tid: 0a70d995b9439375kuwsc1204260ff6 Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Problems exist in the Chinese translation of io_ordering.txt. Partly for the difference between Chinese and English character encoding format, and the others are of the failure to comply with the ReST markups. Signed-off-by: Wang Wenhu --- .../translations/zh_CN/io_ordering.txt | 72 ++++++++++++------- 1 file changed, 46 insertions(+), 26 deletions(-) diff --git a/Documentation/translations/zh_CN/io_ordering.txt b/Documentation/translations/zh_CN/io_ordering.txt index 1f8127bdd415..080ed2911db0 100644 --- a/Documentation/translations/zh_CN/io_ordering.txt +++ b/Documentation/translations/zh_CN/io_ordering.txt @@ -29,39 +29,59 @@ Documentation/io_ordering.txt 的中文翻译 这也可以保证后面的写操作只在前面的写操作之后到达设备（这非常类似于内存 屏障操作，mb()，不过仅适用于I/O）。 +A more concrete example from a hypothetical device driver:: + + ... + CPU A: spin_lock_irqsave(&dev_lock, flags) + CPU A: val = readl(my_status); + CPU A: ... + CPU A: writel(newval, ring_ptr); + CPU A: spin_unlock_irqrestore(&dev_lock, flags) + ... + CPU B: spin_lock_irqsave(&dev_lock, flags) + CPU B: val = readl(my_status); + CPU B: ... + CPU B: writel(newval2, ring_ptr); + CPU B: spin_unlock_irqrestore(&dev_lock, flags) + ... + + 假设一个设备驱动程的具体例子： +:: + ... + CPU A: spin_lock_irqsave(&dev_lock, flags) + CPU A: val = readl(my_status); + CPU A: ... + CPU A: writel(newval, ring_ptr); + CPU A: spin_unlock_irqrestore(&dev_lock, flags) + ... + CPU B: spin_lock_irqsave(&dev_lock, flags) + CPU B: val = readl(my_status); + CPU B: ... + CPU B: writel(newval2, ring_ptr); + CPU B: spin_unlock_irqrestore(&dev_lock, flags) ... -CPU A: spin_lock_irqsave(&dev_lock, flags) -CPU A: val = readl(my_status); -CPU A: ... -CPU A: writel(newval, ring_ptr); -CPU A: spin_unlock_irqrestore(&dev_lock, flags) - ... -CPU B: spin_lock_irqsave(&dev_lock, flags) -CPU B: val = readl(my_status); -CPU B: ... -CPU B: writel(newval2, ring_ptr); -CPU B: spin_unlock_irqrestore(&dev_lock, flags) - ... + 上述例子中，设备可能会先接收到newval2的值，然后接收到newval的值，问题就 发生了。不过很容易通过下面方法来修复： +:: - ... -CPU A: spin_lock_irqsave(&dev_lock, flags) -CPU A: val = readl(my_status); -CPU A: ... -CPU A: writel(newval, ring_ptr); -CPU A: (void)readl(safe_register); /* 配置寄存器？*/ -CPU A: spin_unlock_irqrestore(&dev_lock, flags) - ... -CPU B: spin_lock_irqsave(&dev_lock, flags) -CPU B: val = readl(my_status); -CPU B: ... -CPU B: writel(newval2, ring_ptr); -CPU B: (void)readl(safe_register); /* 配置寄存器？*/ -CPU B: spin_unlock_irqrestore(&dev_lock, flags) + ... + CPU A: spin_lock_irqsave(&dev_lock, flags) + CPU A: val = readl(my_status); + CPU A: ... + CPU A: writel(newval, ring_ptr); + CPU A: (void)readl(safe_register); /* 配置寄存器？*/ + CPU A: spin_unlock_irqrestore(&dev_lock, flags) + ... + CPU B: spin_lock_irqsave(&dev_lock, flags) + CPU B: val = readl(my_status); + CPU B: ... + CPU B: writel(newval2, ring_ptr); + CPU B: (void)readl(safe_register); /* 配置寄存器？*/ + CPU B: spin_unlock_irqrestore(&dev_lock, flags) 在解决方案中，读取safe_register寄存器，触发IO芯片清刷未处理的写操作， 再处理后面的读操作，防止引发数据不一致问题。 -- 2.17.1