Hi Anson, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 3cea11cd5e3b00d91caf0b4730194039b45c5891 commit: 9a976cd278eafa496ce30196810ef2e879a4a7d5 clk: imx8m: Support module build date: 2 months ago config: x86_64-randconfig-a005-20201102 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 235dfcf70abca65dba5d80f1a42d1485bab8980c) 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9a976cd278eafa496ce30196810ef2e879a4a7d5 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 9a976cd278eafa496ce30196810ef2e879a4a7d5 # 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 All warnings (new ones prefixed by >>): >> drivers/clk/imx/clk-imx8mp.c:757:34: warning: unused variable 'imx8mp_clk_of_match' [-Wunused-const-variable] static const struct of_device_id imx8mp_clk_of_match[] = { ^ 1 warning generated. vim +/imx8mp_clk_of_match +757 drivers/clk/imx/clk-imx8mp.c 9c140d9926761b Anson Huang 2020-01-08 756 9c140d9926761b Anson Huang 2020-01-08 @757 static const struct of_device_id imx8mp_clk_of_match[] = { 9c140d9926761b Anson Huang 2020-01-08 758 { .compatible = "fsl,imx8mp-ccm" }, 9c140d9926761b Anson Huang 2020-01-08 759 { /* Sentinel */ } 9c140d9926761b Anson Huang 2020-01-08 760 }; 9c140d9926761b Anson Huang 2020-01-08 761 MODULE_DEVICE_TABLE(of, imx8mp_clk_of_match); 9c140d9926761b Anson Huang 2020-01-08 762 :::::: The code at line 757 was first introduced by commit :::::: 9c140d9926761b0f5d329ff6c09a1540f3d5e1d3 clk: imx: Add support for i.MX8MP clock driver :::::: TO: Anson Huang :::::: CC: Shawn Guo --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org