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Date: Mon, 25 Mar 2024 22:09:31 -0300
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Subject: Re: [PATCH v2 05/14] drm: Suppress intentional warning backtraces in
 scaling unit tests
To: Guenter Roeck <linux@roeck-us.net>
Cc: linux-kselftest@vger.kernel.org, David Airlie <airlied@gmail.com>,
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From: =?UTF-8?Q?Ma=C3=ADra_Canal?= <mcanal@igalia.com>
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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>

Best Regards,
- Maíra

> Thanks,
> Guenter