linux-kernel - Re: [PATCH] module: kunit: Load .kunit_test_suites section when CONFIG

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Message-ID: <CABVgOSm4=Zz3ypK7uPh3phE9NqOc9mP50Di5pGAdwh2cs538jQ@mail.gmail.com>
Date:   Wed, 20 Jul 2022 17:32:23 +0800
From:   David Gow <davidgow@...gle.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Daniel Latypov <dlatypov@...gle.com>,
        Jeremy Kerr <jk@...econstruct.com.au>,
        linux-modules@...r.kernel.org,
        KUnit Development <kunit-dev@...glegroups.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] module: kunit: Load .kunit_test_suites section when CONFIG_KUNIT=m

On Wed, Jul 20, 2022 at 1:57 AM Luis Chamberlain <mcgrof@...nel.org> wrote:
>
> On Wed, Jul 13, 2022 at 08:52:20AM +0800, David Gow wrote:
> > The new KUnit module handling has KUnit test suites listed in a
> > .kunit_test_suites section of each module. This should be loaded when
> > the module is, but at the moment this only happens if KUnit is built-in.
> >
>
> This commit log does not describe what functionality is broken exactly
> without this commit. What functionality from kunit is provided when
> .kunit_test_suites is available?
>

Sorry: the explanation is a bit obtuse, I admit.

Basically, when kunit itself is built as a module, no tests run. This
is because the code to load the .kunit_test_suites section is compiled
out if kunit is not built-in, but it should be present even if kunit
is built as a module.

> > Also load this when KUnit is enabled as a module: it'll not be usable
> > unless KUnit is loaded,
>
> What benefit is there to load a kunit module without kunit?
>

None whatsoever, and it should be impossible. This was just rationale
for the overhead of loading the section being likely insignificant,
but it's worded pretty poorly.

> > but such modules are likely to depend on KUnit
> > anyway, so it's unlikely to ever be loaded needlessly.
> >
> > Fixes: 3d6e44623841 ("kunit: unify module and builtin suite definitions")
> > Signed-off-by: David Gow <davidgow@...gle.com>

I'll update the commit message when I send a new version of this out.

Cheers,
-- David

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