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Date: Fri, 2 Feb 2024 15:15:46 -0500
From: =?utf-8?B?TsOtY29sYXMgRi4gUi4gQS4=?= Prado <nfraprado@collabora.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Sami Tolvanen <samitolvanen@google.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Ricardo Ribalda <ribalda@chromium.org>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Bill Wendling <morbo@google.com>,
	Justin Stitt <justinstitt@google.com>, Mike Isely <isely@pobox.com>,
	Tiffany Lin <tiffany.lin@mediatek.com>,
	Andrew-CT Chen <andrew-ct.chen@mediatek.com>,
	Yunfei Dong <yunfei.dong@mediatek.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
	llvm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org
Subject: Re: [PATCH 3/3] media: mediatek: vcodedc: Fix
 Wcast-function-type-strict warnings
Message-ID: <12d0c580-788d-4466-af8a-feb5ab3c6677@notapiano>
References: <20240128-fix-clang-warnings-v1-0-1d946013a421@chromium.org>
 <20240128-fix-clang-warnings-v1-3-1d946013a421@chromium.org>
 <20240201221654.GC2240065@dev-arch.thelio-3990X>
 <CABCJKudd3SUy3Qor7Tc0zyJsSAWy0PavbbBFALuWEpBa32pBCQ@mail.gmail.com>
 <5658ec37-868f-454d-a149-467e6de139cd@collabora.com>
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In-Reply-To: <5658ec37-868f-454d-a149-467e6de139cd@collabora.com>

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@kernel.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@chromium.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