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Date: Mon, 25 Mar 2024 16:05:06 -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>, linux-kselftest@vger.kernel.org
Cc: David Airlie <airlied@gmail.com>, Arnd Bergmann <arnd@arndb.de>,
 Dan Carpenter <dan.carpenter@linaro.org>, Kees Cook <keescook@chromium.org>,
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 Arthur Grillo <arthurgrillo@riseup.net>,
 Brendan Higgins <brendan.higgins@linux.dev>,
 Naresh Kamboju <naresh.kamboju@linaro.org>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Andrew Morton <akpm@linux-foundation.org>, Maxime Ripard
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 Linux Kernel Functional Testing <lkft@linaro.org>
References: <20240325175248.1499046-1-linux@roeck-us.net>
 <20240325175248.1499046-6-linux@roeck-us.net>
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From: =?UTF-8?Q?Ma=C3=ADra_Canal?= <mcanal@igalia.com>
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In-Reply-To: <20240325175248.1499046-6-linux@roeck-us.net>
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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.

Best Regards,
- Maíra

>   	scaling_factor = drm_rect_calc_hscale(&params->src, &params->dst,
>   					      params->min_range, params->max_range);
> +	END_SUPPRESSED_WARNING(drm_calc_scale);
>   
>   	KUNIT_EXPECT_EQ(test, scaling_factor, params->expected_scaling_factor);
>   }
>   
>   static void drm_test_rect_calc_vscale(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);
>   	scaling_factor = drm_rect_calc_vscale(&params->src, &params->dst,
>   					      params->min_range, params->max_range);
> +	END_SUPPRESSED_WARNING(drm_calc_scale);
>   
>   	KUNIT_EXPECT_EQ(test, scaling_factor, params->expected_scaling_factor);
>   }