tree: https://github.com/intel/linux-intel-lts.git 5.10/yocto head: d75bc4fd519e80cd379997651b77218cb949ecf7 commit: 3aeb5198342e78c3f2ed6bc9431e492a4550cd2a [1433/2740] fbmem: Mark proc_fb_seq_ops as __maybe_unused config: arm-randconfig-r033-20210720 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 87039c048c0cbc3d8cbba86187269b006bf2f373) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/intel/linux-intel-lts/commit/3aeb5198342e78c3f2ed6bc94... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.10/yocto git checkout 3aeb5198342e78c3f2ed6bc9431e492a4550cd2a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 __maybe_unused seq_operations proc_fb_seq_ops = { ^ include/linux/compiler_attributes.h:267:56: note: expanded from macro '__maybe_unused' #define __maybe_unused __attribute__((__unused__)) ^ include/linux/seq_file.h:31:8: note: previous definition is here struct seq_operations { ^ drivers/video/fbdev/core/fbmem.c:736:51: warning: unused variable 'proc_fb_seq_ops' [-Wunused-const-variable] static const struct __maybe_unused seq_operations proc_fb_seq_ops = { ^ 2 warnings generated. vim +736 drivers/video/fbdev/core/fbmem.c 735 737 .start = fb_seq_start, 738 .next = fb_seq_next, 739 .stop = fb_seq_stop, 740 .show = fb_seq_show, 741 }; 742 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org