linux-kernel - Re: [PATCH] kunit: cs_dsp: Depend on FW_CS

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Message-ID: <a0fdd818-a4be-446e-b18e-0c655bc94c9a@sirena.org.uk>
Date: Thu, 20 Mar 2025 22:48:56 +0000
From: Mark Brown <broonie@...nel.org>
To: Nico Pache <npache@...hat.com>
Cc: rf@...nsource.cirrus.com, patches@...nsource.cirrus.com,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	kunit-dev@...glegroups.com, simont@...nsource.cirrus.com,
	ckeepax@...nsource.cirrus.com, brendan.higgins@...ux.dev,
	davidgow@...gle.com, rmoar@...gle.com, johannes.berg@...el.com,
	sj@...nel.org
Subject: Re: [PATCH] kunit: cs_dsp: Depend on FW_CS_DSP rather then enabling
 it

On Thu, Mar 20, 2025 at 04:21:16PM -0600, Nico Pache wrote:
> On Thu, Mar 20, 2025 at 1:14 PM Mark Brown <broonie@...nel.org> wrote:
> > On Wed, Mar 19, 2025 at 05:05:39PM -0600, Nico Pache wrote:

> > >  config FW_CS_DSP_KUNIT_TEST
> > >       tristate "KUnit tests for Cirrus Logic cs_dsp" if !KUNIT_ALL_TESTS
> > > -     depends on KUNIT && REGMAP
> > > +     depends on KUNIT && REGMAP && FW_CS_DSP
> > >       default KUNIT_ALL_TESTS
> > > -     select FW_CS_DSP

> > This makes no sense to me, the select statement is forcing on the code
> > it's testing which is a library and so is selected by it's users, this

> Similarly to eb5c79828cfa ("firmware: cs_dsp: FW_CS_DSP_KUNIT_TEST
> should not select REGMAP"), We shouldnt force a feature on when using
> KUNIT_ALL_TESTS.

This feature is not user selectable, at an absolute minimum you would
need to make the library available in KUnit test builds.

> > change will just stop the tests being run unless someone does the dance
> > to enable a driver which relies on the library.  That is something that

> My config also sets the UML wrapper to enable this FW_CS_DSP config so
> it will continue to work in that environment.

Simply adding it to the all_tests.config will just result in it getting
turned off by Kconfig during the build since it's not a visible option
so that's not accomplishing anything.  all_tests.config is not UML
specific, it's for enabling all the KUnit tests that could run in UML no
matter how you're running them.

> > seems unlikely to change the outcome of the tests when run from KUnit
> > which is independent of any hardware.

> KUNIT is supported outside the UML environment, and some distros (like
> fedora, and downstream flavors), use KUNIT as modules, with
> KUNIT_ALL_TESTS=m. We only want the tests that are supported by our
> config to be available, we dont want KUNIT going and enabling other
> features so the test works.

The point is not that KUnit is frequently run in UML (personally I
mostly run it with emulated hardware instead) but rather that this is a
library which can be tested independently of having a relevant DSP.

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