Hi Baolin, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 071a0578b0ce0b0e543d1e38ee6926b9cc21c198 commit: ffd0bbfb378ecd56eac22bf932ccdbf89ac7f725 hwspinlock: Allow drivers to be built with COMPILE_TEST date: 7 months ago config: x86_64-randconfig-r005-20201018 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 50cc9a0e6124f6177633b9e5edcee25860cfa094) 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... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout ffd0bbfb378ecd56eac22bf932ccdbf89ac7f725 # 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 >>): static const struct of_device_id sprd_hwspinlock_of_match[] = { ^ 1 warning generated. vim +/sprd_hwspinlock_of_match +141 drivers/hwspinlock/sprd_hwspinlock.c d8c8bbbb1aba547 Baolin Wang 2017-05-17 140 d8c8bbbb1aba547 Baolin Wang 2017-05-17 @141 static const struct of_device_id sprd_hwspinlock_of_match[] = { d8c8bbbb1aba547 Baolin Wang 2017-05-17 142 { .compatible = "sprd,hwspinlock-r3p0", }, d8c8bbbb1aba547 Baolin Wang 2017-05-17 143 { /* sentinel */ } d8c8bbbb1aba547 Baolin Wang 2017-05-17 144 }; d8c8bbbb1aba547 Baolin Wang 2017-05-17 145 MODULE_DEVICE_TABLE(of, sprd_hwspinlock_of_match); d8c8bbbb1aba547 Baolin Wang 2017-05-17 146 :::::: The code at line 141 was first introduced by commit :::::: d8c8bbbb1aba547b6c0d534f87fc68aa338658fc hwspinlock: sprd: Add hardware spinlock driver :::::: TO: Baolin Wang <baolin.wang(a)spreadtrum.com&gt; :::::: CC: Bjorn Andersson <bjorn.andersson(a)linaro.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org