Hi Amit, FYI, the error/warning still remains. tree: https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.4 head: 2f686fa6c0bf7fa168dc45dd7ce1359217212911 commit: 3780469dd372e934445de2fbb5e8cf6e712b9b99 [842/1765] spi: Add Zynq QSPI controller driver config: x86_64-randconfig-r013-20210720 (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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/Xilinx/linux-xlnx/commit/3780469dd372e934445de2fbb5e8c... git remote add xlnx https://github.com/Xilinx/linux-xlnx git fetch --no-tags xlnx xlnx_rebase_v5.4 git checkout 3780469dd372e934445de2fbb5e8cf6e712b9b99 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): bool update_stripe(const u8 opcode) ^ drivers/spi/spi-mem.c:18:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool update_stripe(const u8 opcode) ^ static 1 warning generated. vim +/update_stripe +18 drivers/spi/spi-mem.c 17 19 { 20 if (opcode == SPINOR_OP_BE_4K || 21 opcode == SPINOR_OP_BE_32K || 22 opcode == SPINOR_OP_CHIP_ERASE || 23 opcode == SPINOR_OP_SE || 24 opcode == SPINOR_OP_BE_32K_4B || 25 opcode == SPINOR_OP_SE_4B || 26 opcode == SPINOR_OP_BE_4K_4B || 27 opcode == SPINOR_OP_WRSR || 28 opcode == SPINOR_OP_WREAR || 29 opcode == SPINOR_OP_BRWR || 30 opcode == SPINOR_OP_WRSR2) 31 return false; 32 33 return true; 34 } 35 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org