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Date: Mon, 25 Mar 2024 22:02:33 -0700
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Subject: Re: [PATCH v2 05/14] drm: Suppress intentional warning backtraces in
 scaling unit tests
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To: =?UTF-8?Q?Ma=C3=ADra_Canal?= <mcanal@igalia.com>
Cc: linux-kselftest@vger.kernel.org, David Airlie <airlied@gmail.com>,
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From: Guenter Roeck <linux@roeck-us.net>
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In-Reply-To: <7f6a223f-f432-4e1b-a67e-3816448224a1@igalia.com>
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On 3/25/24 18:09, Maíra Canal wrote:
> On 3/25/24 16:24, Guenter Roeck wrote:
>> Hi,
>>
>> On Mon, Mar 25, 2024 at 04:05:06PM -0300, Maíra Canal wrote:
>>> Hi Guenter,
>>>
>>> On 3/25/24 14:52, Guenter Roeck wrote:
>>>> The drm_test_rect_calc_hscale and drm_test_rect_calc_vscale unit tests
>>>> intentionally trigger warning backtraces by providing bad parameters to
>>>> the tested functions. What is tested is the return value, not the existence
>>>> of a warning backtrace. Suppress the backtraces to avoid clogging the
>>>> kernel log.
>>>>
>>>> Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
>>>> Acked-by: Dan Carpenter <dan.carpenter@linaro.org>
>>>> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
>>>> ---
>>>> - Rebased to v6.9-rc1
>>>> - Added Tested-by:, Acked-by:, and Reviewed-by: tags
>>>>
>>>>    drivers/gpu/drm/tests/drm_rect_test.c | 6 ++++++
>>>>    1 file changed, 6 insertions(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/tests/drm_rect_test.c b/drivers/gpu/drm/tests/drm_rect_test.c
>>>> index 76332cd2ead8..75614cb4deb5 100644
>>>> --- a/drivers/gpu/drm/tests/drm_rect_test.c
>>>> +++ b/drivers/gpu/drm/tests/drm_rect_test.c
>>>> @@ -406,22 +406,28 @@ KUNIT_ARRAY_PARAM(drm_rect_scale, drm_rect_scale_cases, drm_rect_scale_case_desc
>>>>    static void drm_test_rect_calc_hscale(struct kunit *test)
>>>>    {
>>>> +    DEFINE_SUPPRESSED_WARNING(drm_calc_scale);
>>>>        const struct drm_rect_scale_case *params = test->param_value;
>>>>        int scaling_factor;
>>>> +    START_SUPPRESSED_WARNING(drm_calc_scale);
>>>
>>> I'm not sure if it is not that obvious only to me, but it would be nice
>>> to have a comment here, remembering that we provide bad parameters in
>>> some test cases.
>>
>> Sure. Something like this ?
>>
>>          /*
>>           * drm_rect_calc_hscale() generates a warning backtrace whenever bad
>>           * parameters are passed to it. This affects all unit tests with an
>>           * error code in expected_scaling_factor.
>>           */
>>
> 
> Yeah, perfect. With that, feel free to add my
> 
> Acked-by: Maíra Canal <mcanal@igalia.com>
> 

Thanks!
Guenter