linux-kernel - Re: [PATCH v2 4/4] Documentation: kunit: Add usage notes for kunit_add

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Date:   Fri, 19 May 2023 15:30:47 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     David Gow <davidgow@...gle.com>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Daniel Latypov <dlatypov@...gle.com>,
        Maxime Ripard <maxime@...no.tech>,
        Benjamin Berg <benjamin@...solutions.net>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Stephen Boyd <sboyd@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Rae Moar <rmoar@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Sadiya Kazi <sadiyakazi@...gle.com>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] Documentation: kunit: Add usage notes for
 kunit_add_action()

On Thu, May 18, 2023 at 04:38:46PM +0800, David Gow wrote:
> +Registering Cleanup Actions
> +---------------------------
> +
> +If you need to perform some cleanup beyond simple use of ``kunit_kzalloc``,
> +you can register a cusom "deferred action", which is a cleanup function
> +run when the test exits (whether cleanly, or via a failed assertion).
> +
> +Actions are simple functions with no return value, and a single ``void*``
> +context argument, and forfil the same role as "cleanup" functions in Python
"... fulfill the same role ..."?

> +and Go tests, "defer" statements in languages which support them, and
> +(in some cases) destructors in RAII languages.
> +
> +These are very useful for unregistering things from global lists, closing
> +files or other resources, or freeing resources.
> +
> +For example:
> +
> +.. code-block:: C
> +
> +	static void cleanup_device(void *ctx)
> +	{
> +		struct device *dev = (struct device *)ctx;
> +
> +		device_unregister(dev);
> +	}
> +
> +	void example_device_test(struct kunit *test)
> +	{
> +		struct my_device dev;
> +
> +		device_register(&dev);
> +
> +		kunit_add_action(test, &cleanup_device, &dev);
> +	}
> +
> +Note that, for functions like device_unregister which only accept a single
> +pointer-sized argument, it's possible to directly cast that function to
> +a ``kunit_action_t`` rather than writing a wrapper function, for example:
> +
> +.. code-block:: C
> +
> +	kunit_add_action(test, (kunit_action_t *)&device_unregister, &dev);
> +
> +``kunit_add_action`` can fail if, for example, the system is out of memory.
> +You can use ``kunit_add_action_or_reset`` instead which runs the action
> +immediately if it cannot be deferred.
> +
> +If you need more control over when the cleanup function is called, you
> +can trigger it early using ``kunit_release_action``, or cancel it entirely
> +with ``kunit_remove_action``.
> +
>  
>  Testing Static Functions
>  ------------------------

The rest is LGTM.

-- 
An old man doll... just what I always wanted! - Clara

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