[PATCH v5 4/5] drm: Suppress intentional warning backtraces in scaling unit tests

From: Guenter Roeck linux@roeck-us.net

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 and distraction from real problems.

Tested-by: Linux Kernel Functional Testing lkft@linaro.org Acked-by: Dan Carpenter dan.carpenter@linaro.org Acked-by: Maíra Canal mcanal@igalia.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: David Airlie airlied@gmail.com Cc: Daniel Vetter daniel@ffwll.ch Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Alessandro Carminati acarmina@redhat.com --- drivers/gpu/drm/tests/drm_rect_test.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_rect_test.c b/drivers/gpu/drm/tests/drm_rect_test.c index 17e1f34b7610..867845e7d5ab 100644 --- a/drivers/gpu/drm/tests/drm_rect_test.c +++ b/drivers/gpu/drm/tests/drm_rect_test.c @@ -406,22 +406,38 @@ 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) { + KUNIT_DEFINE_SUPPRESSED_WARNING(drm_calc_scale); const struct drm_rect_scale_case *params = test->param_value; int scaling_factor;

+ /* + * 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. + */ + KUNIT_START_SUPPRESSED_WARNING(drm_calc_scale); scaling_factor = drm_rect_calc_hscale(&params->src, &params->dst, params->min_range, params->max_range); + KUNIT_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) { + KUNIT_DEFINE_SUPPRESSED_WARNING(drm_calc_scale); const struct drm_rect_scale_case *params = test->param_value; int scaling_factor;

+ /* + * drm_rect_calc_vscale() generates a warning backtrace whenever bad + * parameters are passed to it. This affects all unit tests with an + * error code in expected_scaling_factor. + */ + KUNIT_START_SUPPRESSED_WARNING(drm_calc_scale); scaling_factor = drm_rect_calc_vscale(&params->src, &params->dst, params->min_range, params->max_range); + KUNIT_END_SUPPRESSED_WARNING(drm_calc_scale);

KUNIT_EXPECT_EQ(test, scaling_factor, params->expected_scaling_factor); }