linux-kernel - Re: [PATCH v18 15/19] Documentation: kunit: add documentation for KUnit

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Date:   Mon, 23 Sep 2019 12:49:54 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Brendan Higgins <brendanhiggins@...gle.com>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Kees Cook <keescook@...gle.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rob Herring <robh@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        shuah <shuah@...nel.org>, Theodore Ts'o <tytso@....edu>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        devicetree <devicetree@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        kunit-dev@...glegroups.com,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org,
        linux-kbuild <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        linux-um@...ts.infradead.org,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        "Bird, Timothy" <Tim.Bird@...y.com>,
        Amir Goldstein <amir73il@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Daniel Vetter <daniel@...ll.ch>, Jeff Dike <jdike@...toit.com>,
        Joel Stanley <joel@....id.au>,
        Julia Lawall <julia.lawall@...6.fr>,
        Kevin Hilman <khilman@...libre.com>,
        Knut Omang <knut.omang@...cle.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Petr Mladek <pmladek@...e.com>,
        Richard Weinberger <richard@....at>,
        David Rientjes <rientjes@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>, wfg@...ux.intel.com,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Felix Guo <felixguoxiuping@...il.com>,
        Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v18 15/19] Documentation: kunit: add documentation for
 KUnit

On 9/23/19 11:06 AM, Brendan Higgins wrote:
> On Mon, Sep 23, 2019 at 8:48 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>>
>> On 9/23/19 2:02 AM, Brendan Higgins wrote:
>>> Add documentation for KUnit, the Linux kernel unit testing framework.
>>> - Add intro and usage guide for KUnit
>>> - Add API reference
>>>
>>> Signed-off-by: Felix Guo <felixguoxiuping@...il.com>
>>> Signed-off-by: Brendan Higgins <brendanhiggins@...gle.com>
>>> Cc: Jonathan Corbet <corbet@....net>
>>> Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>> Reviewed-by: Logan Gunthorpe <logang@...tatee.com>
>>> Reviewed-by: Stephen Boyd <sboyd@...nel.org>
>>> ---
>>>  Documentation/dev-tools/index.rst           |   1 +
>>>  Documentation/dev-tools/kunit/api/index.rst |  16 +
>>>  Documentation/dev-tools/kunit/api/test.rst  |  11 +
>>>  Documentation/dev-tools/kunit/faq.rst       |  62 +++
>>>  Documentation/dev-tools/kunit/index.rst     |  79 +++
>>>  Documentation/dev-tools/kunit/start.rst     | 180 ++++++
>>>  Documentation/dev-tools/kunit/usage.rst     | 576 ++++++++++++++++++++
>>>  7 files changed, 925 insertions(+)
>>>  create mode 100644 Documentation/dev-tools/kunit/api/index.rst
>>>  create mode 100644 Documentation/dev-tools/kunit/api/test.rst
>>>  create mode 100644 Documentation/dev-tools/kunit/faq.rst
>>>  create mode 100644 Documentation/dev-tools/kunit/index.rst
>>>  create mode 100644 Documentation/dev-tools/kunit/start.rst
>>>  create mode 100644 Documentation/dev-tools/kunit/usage.rst
>>
>>
>>> diff --git a/Documentation/dev-tools/kunit/start.rst b/Documentation/dev-tools/kunit/start.rst
>>> new file mode 100644
>>> index 000000000000..6dc229e46bb3
>>> --- /dev/null
>>> +++ b/Documentation/dev-tools/kunit/start.rst
>>> @@ -0,0 +1,180 @@
>>> +.. SPDX-License-Identifier: GPL-2.0
>>> +
>>> +===============
>>> +Getting Started
>>> +===============
>>> +
>>> +Installing dependencies
>>> +=======================
>>> +KUnit has the same dependencies as the Linux kernel. As long as you can build
>>> +the kernel, you can run KUnit.
>>> +
>>> +KUnit Wrapper
>>> +=============
>>> +Included with KUnit is a simple Python wrapper that helps format the output to
>>> +easily use and read KUnit output. It handles building and running the kernel, as
>>> +well as formatting the output.
>>> +
>>> +The wrapper can be run with:
>>> +
>>> +.. code-block:: bash
>>> +
>>> +   ./tools/testing/kunit/kunit.py run
>>> +
>>> +Creating a kunitconfig
>>> +======================
>>> +The Python script is a thin wrapper around Kbuild as such, it needs to be
>>
>>                                        around Kbuild. As such,
> 
> Thanks for pointing this out.
> 
>>
>>> +configured with a ``kunitconfig`` file. This file essentially contains the
>>> +regular Kernel config, with the specific test targets as well.
>>> +
>>> +.. code-block:: bash
>>> +
>>> +     git clone -b master https://kunit.googlesource.com/kunitconfig $PATH_TO_KUNITCONFIG_REPO
>>> +     cd $PATH_TO_LINUX_REPO
>>> +     ln -s $PATH_TO_KUNIT_CONFIG_REPO/kunitconfig kunitconfig
>>> +
>>> +You may want to add kunitconfig to your local gitignore.
>>> +
>>> +Verifying KUnit Works
>>> +---------------------
>>> +
>>> +To make sure that everything is set up correctly, simply invoke the Python
>>> +wrapper from your kernel repo:
>>> +
>>> +.. code-block:: bash
>>> +
>>> +     ./tools/testing/kunit/kunit.py
>>> +
>>> +.. note::
>>> +   You may want to run ``make mrproper`` first.
>>
>> I normally use O=builddir when building kernels.
>> Does this support using O=builddir ?
> 
> Yep, it supports specifying a separate build directory.
> 
>>> +
>>> +If everything worked correctly, you should see the following:
>>> +
>>> +.. code-block:: bash
>>> +
>>> +     Generating .config ...
>>> +     Building KUnit Kernel ...
>>> +     Starting KUnit Kernel ...
>>> +
>>> +followed by a list of tests that are run. All of them should be passing.
>>> +
>>> +.. note::
>>> +   Because it is building a lot of sources for the first time, the ``Building
>>> +   kunit kernel`` step may take a while.
>>> +
>>> +Writing your first test
>>> +=======================
>>
>> [snip]
>>
>>> diff --git a/Documentation/dev-tools/kunit/usage.rst b/Documentation/dev-tools/kunit/usage.rst
>>> new file mode 100644
>>> index 000000000000..c6e69634e274
>>> --- /dev/null
>>> +++ b/Documentation/dev-tools/kunit/usage.rst
>>
>> TBD...
> 
> What did you mean by this comment?

I plan to review usage.rst soon... (To Be Done :)

-- 
~Randy