Received-SPF: pass (google.com: domain of linux-kernel+bounces-129807-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
Sender: Guenter Roeck <groeck7@gmail.com>
From: Guenter Roeck <linux@roeck-us.net>
To: linux-kselftest@vger.kernel.org
Cc: David Airlie <airlied@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>,
	=?UTF-8?q?Ma=C3=ADra=20Canal?= <mcanal@igalia.com>,
	Dan Carpenter <dan.carpenter@linaro.org>,
	Kees Cook <keescook@chromium.org>,
	Daniel Diaz <daniel.diaz@linaro.org>,
	David Gow <davidgow@google.com>,
	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 <mripard@kernel.org>,
	=?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	dri-devel@lists.freedesktop.org,
	kunit-dev@googlegroups.com,
	linux-arch@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-parisc@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org,
	linux-riscv@lists.infradead.org,
	linux-s390@vger.kernel.org,
	linux-sh@vger.kernel.org,
	loongarch@lists.linux.dev,
	netdev@vger.kernel.org,
	x86@kernel.org,
	Guenter Roeck <linux@roeck-us.net>,
	Linux Kernel Functional Testing <lkft@linaro.org>
Subject: [PATCH v3 05/15] drm: Suppress intentional warning backtraces in scaling unit tests
Date: Wed,  3 Apr 2024 06:19:26 -0700
Message-Id: <20240403131936.787234-6-linux@roeck-us.net>
In-Reply-To: <20240403131936.787234-1-linux@roeck-us.net>
References: <20240403131936.787234-1-linux@roeck-us.net>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

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>
---
v2:
- Rebased to v6.9-rc1
- Added Tested-by:, Acked-by:, and Reviewed-by: tags
v3:
- Rebased to v6.9-rc2

 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 76332cd2ead8..66851769ee32 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)
 {
+	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.
+	 */
+	START_SUPPRESSED_WARNING(drm_calc_scale);
 	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;
 
+	/*
+	 * 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.
+	 */
+	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);
 }
-- 
2.39.2