linux-kernel - Re: [PATCH v2 0/4] kunit: Add helpers for creating test-managed devices

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Message-ID: <7rgeotye4grxdtbxip53fykjm4a3sudochsfzdvkmyqltvj7zv@qekkt42x2j25>
Date:   Wed, 13 Dec 2023 16:04:52 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     davidgow@...gle.com
Cc:     Rae Moar <rmoar@...gle.com>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        linux-sound@...r.kernel.org
Subject: Re: [PATCH v2 0/4] kunit: Add helpers for creating test-managed
 devices

Hi David,

On Fri, Dec 08, 2023 at 06:09:28PM +0800, davidgow@...gle.com wrote:
> KUnit tests often need to provide a struct device, and thus far have
> mostly been using root_device_register() or platform devices to create
> a 'fake device' for use with, e.g., code which uses device-managed
> resources. This has several disadvantages, including not being designed
> for test use, scattering files in sysfs, and requiring manual teardown
> on test exit, which may not always be possible in case of failure.
> 
> Instead, introduce a set of helper functions which allow devices
> (internally a struct kunit_device) to be created and managed by KUnit --
> i.e., they will be automatically unregistered on test exit. These
> helpers can either use a user-provided struct device_driver, or have one
> automatically created and managed by KUnit. In both cases, the device
> lives on a new kunit_bus.
> 
> This is a follow-up to a previous proposal here:
> https://lore.kernel.org/linux-kselftest/20230325043104.3761770-1-davidgow@google.com/
> 
> (The kunit_defer() function in the first patch there has since been
> merged as the 'deferred actions' feature.)
> 
> My intention is to take this whole series in via the kselftest/kunit
> branch, but I'm equally okay with splitting up the later patches which
> use this to go via the various subsystem trees in case there are merge
> conflicts.

Could you take (and apply eventually) that patch as part of your series?
https://lore.kernel.org/linux-kselftest/20231205090405.153140-1-mripard@kernel.org/

Thanks
Maxime

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