Commit 7712cfd6 authored by Alex Shi's avatar Alex Shi Committed by Jonathan Corbet

docs/zh_CN: volatile doc format changes

make it readble as rst format for html etc doc making.
Signed-off-by: default avatarAlex Shi <alex.shi@linux.alibaba.com>
Cc: Harry Wei <harryxiyou@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Bryan Wu <bryan.wu@analog.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Coly Li <colyli@suse.de>
Signed-off-by: default avatarWeiwei Jia <harryxiyou@gmail.com>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent bc31de56
Chinese translated version of Documentation/process/volatile-considered-harmful.rst
.. _cn_volatile_considered_harmful:
If you have any comment or update to the content, please contact the
original document maintainer directly. However, if you have a problem
communicating in English you can also ask the Chinese maintainer for
help. Contact the Chinese maintainer if this translation is outdated
or if there is a problem with the translation.
.. include:: ../disclaimer-zh_CN.rst
Maintainer: Jonathan Corbet <corbet@lwn.net>
Chinese maintainer: Bryan Wu <bryan.wu@analog.com>
---------------------------------------------------------------------
Documentation/process/volatile-considered-harmful.rst 的中文翻译
:Original: :ref:`Documentation/process/volatile-considered-harmful.rst
<volatile_considered_harmful>`
如果想评论或更新本文的内容,请直接联系原文档的维护者。如果你使用英文
交流有困难的话,也可以向中文版维护者求助。如果本翻译更新不及时或者翻
译存在问题,请联系中文版维护者
译存在问题,请联系中文版维护者::
英文版维护者: Jonathan Corbet <corbet@lwn.net>
中文版维护者: 伍鹏 Bryan Wu <bryan.wu@analog.com>
中文版翻译者: 伍鹏 Bryan Wu <bryan.wu@analog.com>
中文版校译者: 张汉辉 Eugene Teo <eugeneteo@kernel.sg>
杨瑞 Dave Young <hidave.darkstar@gmail.com>
以下为正文
---------------------------------------------------------------------
英文版维护者: Jonathan Corbet <corbet@lwn.net>
中文版维护者: 伍鹏 Bryan Wu <bryan.wu@analog.com>
中文版翻译者: 伍鹏 Bryan Wu <bryan.wu@analog.com>
中文版校译者: 张汉辉 Eugene Teo <eugeneteo@kernel.sg>
杨瑞 Dave Young <hidave.darkstar@gmail.com>
时奎亮 Alex Shi <alex.shi@linux.alibaba.com>
为什么不应该使用“volatile”类型
------------------------------
==============================
C程序员通常认为volatile表示某个变量可以在当前执行的线程之外被改变;因此,在内核
中用到共享数据结构时,常常会有C程序员喜欢使用volatile这类变量。换句话说,他们经
......@@ -41,7 +34,7 @@ C程序员通常认为volatile表示某个变量可以在当前执行的线程
必要再使用volatile。如果仍然必须使用volatile,那么几乎可以肯定在代码的某处有一
个bug。在正确设计的内核代码中,volatile能带来的仅仅是使事情变慢。
思考一下这段典型的内核代码
思考一下这段典型的内核代码::
spin_lock(&the_lock);
do_something_on(&shared_data);
......@@ -66,7 +59,7 @@ volatile的存储类型最初是为那些内存映射的I/O寄存器而定义。
是必需的。
另一种引起用户可能使用volatile的情况是当处理器正忙着等待一个变量的值。正确执行一
个忙等待的方法是
个忙等待的方法是::
while (my_variable != what_i_want)
cpu_relax();
......
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