tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 49e7e3e905e437a02782019570f70997e2da9101 commit: f89c696e7f635487481eee0d196ab49730ce8664 [6496/11956] drm/mediatek: mtk_dpi: Convert to bridge driver config: arm64-randconfig-r035-20200929 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project de55ebe3bbc77882901ae2b9654503b7611b28f3) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... 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 f89c696e7f635487481eee0d196ab49730ce8664 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static const struct drm_encoder_funcs mtk_dpi_encoder_funcs = { ^ 1 warning generated. vim +/mtk_dpi_encoder_funcs +530 drivers/gpu/drm/mediatek/mtk_dpi.c 529 531 .destroy = mtk_dpi_encoder_destroy, 532 }; 533 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org