linux-kernel - Re: [PATCH v4 2/8] kunit: drm/tests: move generic helpers

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Date:   Fri, 17 Mar 2023 16:09:16 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Matti Vaittinen <mazziesaccount@...il.com>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Maíra Canal <mcanal@...lia.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCH v4 2/8] kunit: drm/tests: move generic helpers

Hi Matti,

On Fri, Mar 17, 2023 at 04:42:25PM +0200, Matti Vaittinen wrote:
> The creation of a dummy device in order to test managed interfaces is a
> generally useful test feature. The drm test helpers
> test_kunit_helper_alloc_device() and test_kunit_helper_free_device()
> are doing exactly this. It makes no sense that each and every component
> which intends to be testing managed interfaces will create similar
> helpers.
> 
> Move these functions to place where it is more obvious they can be used
> also by other subsystems but drm.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
> 
> ---
> 
> Please note that there's something similat ongoing in the CCF:
> https://lore.kernel.org/all/20230302013822.1808711-1-sboyd@kernel.org/
> 
> I do like the simplicity of these DRM-originated helpers so I think
> they're worth. I do equally like the Stephen's idea of having the
> "dummy platform device" related helpers under drivers/base and the
> header being in include/kunit/platform_device.h which is similar to real
> platform device under include/linux/platform_device.h - so, in the end
> of the day I hope Stephen's changes as well as the changes this patch
> introduces to end up in those files. This, however, will require some
> co-operation to avoid conflicts.

I think you would have an easier time if you just copied and renamed
them into the kunit folder as an preparation series.

That way, you wouldn't have to coordinate DRM, CCF and IIO, you'd just
create new helpers that can be reused/converted to by everyone eventually.

Maxime