linux-kernel - Re: [PATCH v2 3/3] media: mediatek: vcodedc: Fix Wcast-function-type-strict warnings

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Date: Tue, 27 Feb 2024 13:59:59 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Ricardo Ribalda" <ribalda@...omium.org>,
 "Hans Verkuil" <hverkuil@...all.nl>
Cc: "Mauro Carvalho Chehab" <mchehab@...nel.org>,
 "Nathan Chancellor" <nathan@...nel.org>,
 "Nick Desaulniers" <ndesaulniers@...gle.com>,
 "Bill Wendling" <morbo@...gle.com>, "Justin Stitt" <justinstitt@...gle.com>,
 "Mike Isely at pobox" <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>,
 "AngeloGioacchino Del Regno" <angelogioacchino.delregno@...labora.com>,
 "Bjorn Andersson" <andersson@...nel.org>,
 "Mathieu Poirier" <mathieu.poirier@...aro.org>,
 "Sebastian Fricke" <sebastian.fricke@...labora.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, linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH v2 3/3] media: mediatek: vcodedc: Fix Wcast-function-type-strict
 warnings

On Tue, Feb 27, 2024, at 12:35, Ricardo Ribalda wrote:
> On Tue, 27 Feb 2024 at 12:17, Hans Verkuil <hverkuil@...all.nl> wrote:
>>
>> Ricardo,
>>
>> First of all, note the typo in theo subject line: vcodedc -> vcodec.
>>
>> There is also a similar (but not identical!) patch from Arnd:
>>
>> https://patchwork.linuxtv.org/project/linux-media/patch/20240224121059.1806691-1-arnd@kernel.org/
>>
>> That patch and yours share the change to common/mtk_vcodec_fw_vpu.c but otherwise
>> they are different, which is a bit odd.
>>
>> Can you take a look at Arnd's patch and see if you need to incorporate his changes
>> into your patch?
>
> We went separate paths :), I tried to make everything const (and
> therefore the remoteproc changes) and he removed the const.

I had the same patch 3 originally but there was still a
warning or a cast from const to non-const pointer, so I
went with the simpler approach that I posted. 

Without that regression, your patch would be nicer, but I
think the version you sent has the same regression that
I ran into.

> His patch looks good to me. Shall I resend the series without this
> patch or you can ignore 3/3 and take 1 and 2?

I also sent your patches 1 and 2 with minor differences in
whitespace. Both of these are already in linux-next, so I think
you don't have to resend anything here.

I sent a whole lot of -Wcast-function-type-strict warning fixes
to address all randconfig builds on arm64, arm and x86, all but
three are now merged. Aside from the mediatek vcodec, the only
missing ones are

https://lore.kernel.org/all/20240213095631.454543-1-arnd@kernel.org/
https://lore.kernel.org/all/20240213100238.456912-1-arnd@kernel.org/

I also had one patch for s390 but none of the other architectures.
I think once Hans applies the vcodec patch, I'll resend the
last two patches together with a patch to enable the warning by
default.

     Arnd