linux-kernel - Re: [PATCH v2 05/14] drm: Suppress intentional warning backtraces in scaling unit tests

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Date: Mon, 25 Mar 2024 22:09:31 -0300
From: Maíra Canal <mcanal@...lia.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: linux-kselftest@...r.kernel.org, David Airlie <airlied@...il.com>,
 Arnd Bergmann <arnd@...db.de>, Dan Carpenter <dan.carpenter@...aro.org>,
 Kees Cook <keescook@...omium.org>, Daniel Diaz <daniel.diaz@...aro.org>,
 David Gow <davidgow@...gle.com>, Arthur Grillo <arthurgrillo@...eup.net>,
 Brendan Higgins <brendan.higgins@...ux.dev>,
 Naresh Kamboju <naresh.kamboju@...aro.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Maxime Ripard
 <mripard@...nel.org>, Ville Syrjälä
 <ville.syrjala@...ux.intel.com>, Daniel Vetter <daniel@...ll.ch>,
 Thomas Zimmermann <tzimmermann@...e.de>, dri-devel@...ts.freedesktop.org,
 kunit-dev@...glegroups.com, linux-arch@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
 linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
 loongarch@...ts.linux.dev, netdev@...r.kernel.org,
 Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: [PATCH v2 05/14] drm: Suppress intentional warning backtraces in
 scaling unit tests

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@...aro.org>
>>> Acked-by: Dan Carpenter <dan.carpenter@...aro.org>
>>> Signed-off-by: Guenter Roeck <linux@...ck-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@...lia.com>

Best Regards,
- Maíra

> Thanks,
> Guenter