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; ^~~ ~~~~~~~~~~~~~~~~~~~~~~~ vim +/pfb +133 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c 8cdc3794b2e34b Yunfei Dong 2021-08-06 127 8cdc3794b2e34b Yunfei Dong 2021-08-06 128 static struct vdec_fb *vdec_get_cap_buffer(struct mtk_vcodec_ctx *ctx, 8cdc3794b2e34b Yunfei Dong 2021-08-06 129 struct vb2_v4l2_buffer *vb2_v4l2) 8cdc3794b2e34b Yunfei Dong 2021-08-06 130 { 8cdc3794b2e34b Yunfei Dong 2021-08-06 131 struct mtk_video_dec_buf *framebuf = 8cdc3794b2e34b Yunfei Dong 2021-08-06 132 container_of(vb2_v4l2, struct mtk_video_dec_buf, m2m_buf.vb); 8cdc3794b2e34b Yunfei Dong 2021-08-06 @133 struct vdec_fb *pfb = &framebuf->frame_buffer; 8cdc3794b2e34b Yunfei Dong 2021-08-06 134 struct vb2_buffer *dst_buf = &vb2_v4l2->vb2_buf; 8cdc3794b2e34b Yunfei Dong 2021-08-06 135 8cdc3794b2e34b Yunfei Dong 2021-08-06 @136 pfb = &framebuf->frame_buffer; 8cdc3794b2e34b Yunfei Dong 2021-08-06 137 pfb->base_y.va = NULL; 8cdc3794b2e34b Yunfei Dong 2021-08-06 138 pfb->base_y.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 0); 8cdc3794b2e34b Yunfei Dong 2021-08-06 139 pfb->base_y.size = ctx->q_data[MTK_Q_DATA_DST].sizeimage[0]; 8cdc3794b2e34b Yunfei Dong 2021-08-06 140 8cdc3794b2e34b Yunfei Dong 2021-08-06 141 if (ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes == 2) { 8cdc3794b2e34b Yunfei Dong 2021-08-06 142 pfb->base_c.va = NULL; 8cdc3794b2e34b Yunfei Dong 2021-08-06 143 pfb->base_c.dma_addr = 8cdc3794b2e34b Yunfei Dong 2021-08-06 144 vb2_dma_contig_plane_dma_addr(dst_buf, 1); 8cdc3794b2e34b Yunfei Dong 2021-08-06 145 pfb->base_c.size = ctx->q_data[MTK_Q_DATA_DST].sizeimage[1]; 8cdc3794b2e34b Yunfei Dong 2021-08-06 146 } 8cdc3794b2e34b Yunfei Dong 2021-08-06 147 mtk_v4l2_debug(1, "id=%d Framebuf pfb=%p VA=%p Y_DMA=%pad C_DMA=%pad Size=%zx frame_count = %d", 8cdc3794b2e34b Yunfei Dong 2021-08-06 148 dst_buf->index, pfb, pfb->base_y.va, &pfb->base_y.dma_addr, 8cdc3794b2e34b Yunfei Dong 2021-08-06 149 &pfb->base_c.dma_addr, pfb->base_y.size, ctx->decoded_frame_cnt); 8cdc3794b2e34b Yunfei Dong 2021-08-06 150 8cdc3794b2e34b Yunfei Dong 2021-08-06 151 return pfb; 8cdc3794b2e34b Yunfei Dong 2021-08-06 152 } 8cdc3794b2e34b Yunfei Dong 2021-08-06 153 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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