linux-kernel - Re: [PATCH v1 4/5] lib/cpumask

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Date:   Wed, 10 Aug 2022 12:07:02 +0800
From:   David Gow <davidgow@...gle.com>
To:     Sander Vanheule <sander@...nheule.net>
Cc:     Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Maíra Canal <mairacanal@...eup.net>
Subject: Re: [PATCH v1 4/5] lib/cpumask_kunit: log mask contents

On Wed, Aug 10, 2022 at 2:09 AM Sander Vanheule <sander@...nheule.net> wrote:
>
> For extra context, log the contents of the masks under test.  This
> should help with finding out why a certain test fails.
>
> Link: https://lore.kernel.org/lkml/CABVgOSkPXBc-PWk1zBZRQ_Tt+Sz1ruFHBj3ixojymZF=Vi4tpQ@mail.gmail.com/
> Suggested-by: David Gow <davidgow@...gle.com>
> Signed-off-by: Sander Vanheule <sander@...nheule.net>
> ---

Thanks!

Another option would be to only print this on test failure, but it's
fine as-is as well.

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

Cheers,
-- David


>  lib/cpumask_kunit.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/lib/cpumask_kunit.c b/lib/cpumask_kunit.c
> index 4d353614d853..0f8059a5e93b 100644
> --- a/lib/cpumask_kunit.c
> +++ b/lib/cpumask_kunit.c
> @@ -51,6 +51,10 @@
>  static cpumask_t mask_empty;
>  static cpumask_t mask_all;
>
> +#define STR_MASK(m)                    #m
> +#define TEST_CPUMASK_PRINT(test, mask) \
> +       kunit_info(test, "%s = '%*pbl'\n", STR_MASK(mask), nr_cpumask_bits, cpumask_bits(mask))
> +
>  static void test_cpumask_weight(struct kunit *test)
>  {
>         KUNIT_EXPECT_TRUE(test, cpumask_empty(&mask_empty));
> @@ -103,6 +107,9 @@ static void test_cpumask_iterators_builtin(struct kunit *test)
>         /* Ensure the dynamic masks are stable while running the tests */
>         cpu_hotplug_disable();
>
> +       TEST_CPUMASK_PRINT(test, cpu_online_mask);
> +       TEST_CPUMASK_PRINT(test, cpu_present_mask);
> +
>         EXPECT_FOR_EACH_CPU_BUILTIN_EQ(test, online);
>         EXPECT_FOR_EACH_CPU_BUILTIN_EQ(test, present);
>
> @@ -114,6 +121,9 @@ static int test_cpumask_init(struct kunit *test)
>         cpumask_clear(&mask_empty);
>         cpumask_setall(&mask_all);
>
> +       TEST_CPUMASK_PRINT(test, &mask_all);
> +       TEST_CPUMASK_PRINT(test, cpu_possible_mask);
> +
>         return 0;
>  }
>
> --
> 2.37.1
>