linux-kernel - Re: [PATCH v3 1/3] kunit: Report the count of test suites in a module

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Date:   Thu, 3 Aug 2023 16:57:43 -0400
From:   Rae Moar <rmoar@...gle.com>
To:     Janusz Krzysztofik <janusz.krzysztofik@...ux.intel.com>
Cc:     Brendan Higgins <brendan.higgins@...ux.dev>,
        David Gow <davidgow@...gle.com>,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        igt-dev@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] kunit: Report the count of test suites in a module

On Mon, Jul 31, 2023 at 10:12 AM Janusz Krzysztofik
<janusz.krzysztofik@...ux.intel.com> wrote:
>
> According to KTAP specification[1], results should always start from a
> header that provides a TAP protocol version, followed by a test plan with
> a count of items to be executed.  That pattern should be followed at each
> nesting level.  In the current implementation of the top-most, i.e., test
> suite level, those rules apply only for test suites built into the kernel,
> executed and reported on boot.  Results submitted to dmesg from kunit test
> modules loaded later are missing those top-level headers.
>
> As a consequence, if a kunit test module provides more than one test suite
> then, without the top level test plan, external tools that are parsing
> dmesg for kunit test output are not able to tell how many test suites
> should be expected and whether to continue parsing after complete output
> from the first test suite is collected.
>
> Submit the top-level headers also from the kunit test module notifier
> initialization callback.
>
> [1] https://docs.kernel.org/dev-tools/ktap.html#
>
> Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@...ux.intel.com>
> ---

Hi!

I think this is a really great idea to improve the KTAP compatibility
for module output. I do agree with Mauro and I wonder if this could be
replaced with using kunit_exec_run_tests. However, if the output of
1..0 for a module with no KUnit tests run is not wanted, I am ok with
this change as is.

LGTM.

Tested-by: Rae Moar <rmoar@...gle.com>

-Rae

>  lib/kunit/test.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> index 84e4666555c94..a29ca1acc4d81 100644
> --- a/lib/kunit/test.c
> +++ b/lib/kunit/test.c
> @@ -729,6 +729,11 @@ EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);
>  #ifdef CONFIG_MODULES
>  static void kunit_module_init(struct module *mod)
>  {
> +       if (mod->num_kunit_suites > 0) {
> +               pr_info("KTAP version 1\n");
> +               pr_info("1..%d\n", mod->num_kunit_suites);
> +       }
> +
>         __kunit_test_suites_init(mod->kunit_suites, mod->num_kunit_suites);
>  }
>
> --
> 2.41.0
>
> --
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