linux-kernel - Re: [PATCH 3/3] media: mediatek: vcodedc: Fix Wcast-function-type-strict warnings

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Date: Fri, 2 Feb 2024 13:58:05 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Sami Tolvanen <samitolvanen@...gle.com>,
 Nathan Chancellor <nathan@...nel.org>, Ricardo Ribalda
 <ribalda@...omium.org>, Nícolas F. R. A. Prado
 <nfraprado@...labora.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling
 <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Mike Isely <isely@...ox.com>, Tiffany Lin <tiffany.lin@...iatek.com>,
 Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
 Yunfei Dong <yunfei.dong@...iatek.com>,
 Matthias Brugger <matthias.bgg@...il.com>, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 3/3] media: mediatek: vcodedc: Fix
 Wcast-function-type-strict warnings

Il 01/02/24 23:25, Sami Tolvanen ha scritto:
> On Thu, Feb 1, 2024 at 10:17 PM Nathan Chancellor <nathan@...nel.org> wrote:
>>
>> On Sun, Jan 28, 2024 at 02:12:22AM +0000, Ricardo Ribalda wrote:
>>> Building with LLVM=1 throws the following warning:
>>> drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c:38:32: warning: cast from 'mtk_vcodec_ipi_handler' (aka 'void (*)(void *, unsigned int, void *)') to 'ipi_handler_t' (aka 'void (*)(const void *, unsigned int, void *)') converts to incompatible function type [-Wcast-function-type-strict]
>>>
>>> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
>>
>> I am not positive because I don't have any hardware to test this driver
>> but I suspect this patch is just hiding the warning without actually
>> addressing the issue that it is pointing out.
> 
> Agreed, this won't fix the issue. The correct solution is to drop the
> cast and change the handler type to match the pointer type (i.e. use
> const void* for the first argument).
> 

Even though I agree that the correct solution is to change the handler's type,
I think that having a test on the actual hardware done is still valuable.

We scheduled a job on KernelCI to test this commit on our integration kernel,
you'll get results for ChromeOS' tast decoders (MT8195 only) and Fluster tests
on MT8183/8186/8192/8195.

The results should be available in a couple of hours here, relative to commit 
`49955a84129dbe1f94fedf729690efcf28513828` on our tree:
https://chromeos.kernelci.org/job/collabora-chromeos-kernel/branch/for-kernelci/

P.S.: If they don't, feel free to ping me or Nicolas (added to the loop) about it.

Cheers,
Angelo