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 12:24:40 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Maíra Canal <mcanal@...lia.com>
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

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.
         */

Thanks,
Guenter