Hi Baolin, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 06a81c1c7db9bd5de0bd38cd5acc44bb22b99150 commit: ffd0bbfb378ecd56eac22bf932ccdbf89ac7f725 hwspinlock: Allow drivers to be built with COMPILE_TEST date: 5 months ago config: x86_64-randconfig-a004-20200810 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 0b90a08f7722980f6074c6eada8022242408cdb4) 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 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 sirf_hwpinlock_ids[] = { ^ 1 warning generated. vim +/sirf_hwpinlock_ids +87 drivers/hwspinlock/sirf_hwspinlock.c cc16d664e21ef6 Wei Chen 2015-05-26 86 cc16d664e21ef6 Wei Chen 2015-05-26 @87 static const struct of_device_id sirf_hwpinlock_ids[] = { cc16d664e21ef6 Wei Chen 2015-05-26 88 { .compatible = "sirf,hwspinlock", }, cc16d664e21ef6 Wei Chen 2015-05-26 89 {}, cc16d664e21ef6 Wei Chen 2015-05-26 90 }; cc16d664e21ef6 Wei Chen 2015-05-26 91 MODULE_DEVICE_TABLE(of, sirf_hwpinlock_ids); cc16d664e21ef6 Wei Chen 2015-05-26 92 :::::: The code at line 87 was first introduced by commit :::::: cc16d664e21ef640faaf51e9952384cf90b92d9f hwspinlock: add a CSR atlas7 driver :::::: TO: Wei Chen <wei.chen(a)csr.com&gt; :::::: CC: Ohad Ben-Cohen <ohad(a)wizery.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org