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 <20240321143200.1854489-1-smayhew@redhat.com>
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From: David Gow <davidgow@google.com>
Date: Sat, 23 Mar 2024 13:24:58 +0800
Message-ID: <CABVgOSmDJpU7km5em_WbY1A04f+AF74a8_4GccjrJk1nW+1Fww@mail.gmail.com>
Subject: Re: [PATCH] kunit: bail out early in __kunit_test_suites_init() if
 there are no suites to test
To: Scott Mayhew <smayhew@redhat.com>
Cc: brendanhiggins@google.com, rmoar@google.com, npache@redhat.com, 
	linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, 
	linux-nfs@vger.kernel.org
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On Thu, 21 Mar 2024 at 22:32, Scott Mayhew <smayhew@redhat.com> wrote:
>
> Commit c72a870926c2 added a mutex to prevent kunit tests from running
> concurrently.  Unfortunately that mutex gets locked during module load
> regardless of whether the module actually has any kunit tests.  This
> causes a problem for kunit tests that might need to load other kernel
> modules (e.g. gss_krb5_test loading the camellia module).
>
> So check to see if there are actually any tests to run before locking
> the kunit_run_lock mutex.
>
> Fixes: c72a870926c2 ("kunit: add ability to run tests after boot using debugfs")
> Reported-by: Nico Pache <npache@redhat.com>
> Signed-off-by: Scott Mayhew <smayhew@redhat.com>
> ---

Thanks, this works well here, and is a good idea anyway.

Reviewed-by: David Gow <davidgow@google.com>

Cheers,
-- David

>  lib/kunit/test.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> index 1d1475578515..b8514dbb337c 100644
> --- a/lib/kunit/test.c
> +++ b/lib/kunit/test.c
> @@ -712,6 +712,9 @@ int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_
>  {
>         unsigned int i;
>
> +       if (num_suites == 0)
> +               return 0;
> +
>         if (!kunit_enabled() && num_suites > 0) {
>                 pr_info("kunit: disabled\n");
>                 return 0;
> --
> 2.43.0
>

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