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Message-ID: <df984423-a751-2251-e392-840675da31e5@usp.br>
Date:   Fri, 15 Jul 2022 08:43:02 -0300
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Subject: Re: [PATCH v5 4/9] drm: selftest: convert drm_format selftest to
 KUnit
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To:     Javier Martinez Canillas <javierm@redhat.com>,
        Daniel Latypov <dlatypov@google.com>,
        Guenter Roeck <linux@roeck-us.net>
Cc:     Isabella Basso <isabbasso@riseup.net>, magalilemes00@gmail.com,
        tales.aparecida@gmail.com, mwen@igalia.com, andrealmeid@riseup.net,
        siqueirajordao@riseup.net, Trevor Woerner <twoerner@gmail.com>,
        leandro.ribeiro@collabora.com, n@nfraprado.net,
        Daniel Vetter <daniel@ffwll.ch>,
        Shuah Khan <skhan@linuxfoundation.org>,
        David Airlie <airlied@linux.ie>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        michal.winiarski@intel.com,
        =?UTF-8?B?Sm9zw6kgRXhww7NzaXRv?= <jose.exposito89@gmail.com>,
        David Gow <davidgow@google.com>, brendanhiggins@google.com,
        kunit-dev@googlegroups.com, linux-kselftest@vger.kernel.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
References: <20220708203052.236290-1-maira.canal@usp.br>
 <20220708203052.236290-5-maira.canal@usp.br>
 <20220714235137.GA485839@roeck-us.net>
 <CAGS_qxrhy3=pST9f85fvxubKQShOq1XF6ZHALzMhXDOf5gnaUg@mail.gmail.com>
 <5f9b35b4-09fa-a8a9-3181-cd8cd7898d03@redhat.com>
From:   =?UTF-8?Q?Ma=c3=adra_Canal?= <maira.canal@usp.br>
In-Reply-To: <5f9b35b4-09fa-a8a9-3181-cd8cd7898d03@redhat.com>
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On 7/15/22 03:59, Javier Martinez Canillas wrote:
> On 7/15/22 02:03, Daniel Latypov wrote:
>> On Thu, Jul 14, 2022 at 4:51 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>>
>>> On Fri, Jul 08, 2022 at 05:30:47PM -0300, Maíra Canal wrote:
>>>> Considering the current adoption of the KUnit framework, convert the
>>>> DRM format selftest to the KUnit API.
>>>>
>>>> Tested-by: David Gow <davidgow@google.com>
>>>> Acked-by: Daniel Latypov <dlatypov@google.com>
>>>> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
>>>> Signed-off-by: Maíra Canal <maira.canal@usp.br>
>>>
>>> This patch results in:
>>>
>>> Building powerpc:allmodconfig ... failed
>>> --------------
>>> Error log:
>>> drivers/gpu/drm/tests/drm_format_test.c: In function 'igt_check_drm_format_min_pitch':
>>> drivers/gpu/drm/tests/drm_format_test.c:271:1: error: the frame size of 3712 bytes is larger than 2048 bytes
>>>
>>> presumably due to function nesting.
>>
>> This can happen when there's a lot of KUNIT_EXPECT_* calls in a single function.
>> See [1] for some related context.
>> There were a number of patches that went into 5.18 ([2] and others) to
>> try and mitigate this, but it's not always enough.
>>
>> Ideally the compiler would see that the stack-local variables used in
>> these macros don't need to stick around, but it doesn't always
>> happen...
> 
> Thanks Daniel for the explanation.
> 
>> One workaround would be to split up the test case functions into smaller chunks.
>>
> 
> Maíra,
> 
> Could you please look at splitting in smaller chunks to mitigate this issue ?

I'll look into this during the weekend. Thanks Guenter for the report.

Best Regards,
- Maíra Canal

>