Re: [linux-next:master 4131/8410] drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c:133:18: warning: Value stored to 'pfb' during its initialization is never read [clang-analyzer-deadcode.DeadStores]

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On Tue, Oct 19, 2021 at 9:40 AM kernel test robot <yujie.liu@xxxxxxxxx> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   7c832d2f9b959e3181370c8b0dacaf9efe13fc05
> commit: 8cdc3794b2e34b3ee11ddfccf4af3f64344a1a75 [4131/8410] media: mtk-vcodec: vdec: support stateless API
> config: riscv-randconfig-c006-20211017 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 8ca4b3ef19fe82d7ad6a6e1515317dcc01b41515)
> reproduce (this is a W=1 build):
>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>          chmod +x ~/bin/make.cross
>          # install riscv cross compiling tool for clang build
>          # apt-get install binutils-riscv64-linux-gnu
>          # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=8cdc3794b2e34b3ee11ddfccf4af3f64344a1a75
>          git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>          git fetch --no-tags linux-next master
>          git checkout 8cdc3794b2e34b3ee11ddfccf4af3f64344a1a75
>          # save the attached .config to linux build tree
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv clang-analyzer
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>
>
> clang-analyzer warnings: (new ones prefixed by >>)
>
>  >> drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c:133:18: warning: Value stored to 'pfb' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
>             struct vdec_fb *pfb = &framebuf->frame_buffer;
>                             ^~~   ~~~~~~~~~~~~~~~~~~~~~~~

Proposed a fix:
https://patchwork.linuxtv.org/project/linux-media/patch/20211019085244.1403-1-tzungbi@xxxxxxxxxx/



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