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

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Message-ID: <12d0c580-788d-4466-af8a-feb5ab3c6677@notapiano>
Date: Fri, 2 Feb 2024 15:15:46 -0500
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Sami Tolvanen <samitolvanen@...gle.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Ricardo Ribalda <ribalda@...omium.org>,
	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

On Fri, Feb 02, 2024 at 01:58:05PM +0100, AngeloGioacchino Del Regno wrote:
> 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.

Hi,

the results are available at 

https://chromeos.kernelci.org/test/job/collabora-chromeos-kernel/branch/for-kernelci/kernel/v6.8-rc2-3109-g49955a84129d/

(You need to type "decoder" into the search bar to limit the results to only the
decoder tests)

The only regressions I see are due to infrastructure error or broken test
unrelated to this change (v4l2-decoder-conformance-h264-frext test on
MT8195-Tomato, and cros-tast-decoder-v4l2-sl-h264 test on MT8183-Juniper)

Otherwise, all platforms (MT8183/8186/8192/8195) and video codecs
(VP8/VP9/H264/H265/AV1) seem unaffected.

Note that these are GCC builds.

Thanks,
Nícolas