Hi Baolin, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 7fe10096c1508c7f033d34d0741809f8eecc1ed4 commit: ffd0bbfb378ecd56eac22bf932ccdbf89ac7f725 hwspinlock: Allow drivers to be built with COMPILE_TEST date: 6 months ago :::::: branch date: 23 hours ago :::::: commit date: 6 months ago config: x86_64-randconfig-a015-20200910 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 0a5dc7effb191eff740e0e7ae7bd8e1f6bdb3ad9) 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 omap_hwspinlock_of_match[] = { ^ 1 warning generated. # 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 vim +/omap_hwspinlock_of_match +165 drivers/hwspinlock/omap_hwspinlock.c 70ba4cc26b9f53 Simon Que 2011-02-17 164 65bd4341d61678 Suman Anna 2015-03-04 @165 static const struct of_device_id omap_hwspinlock_of_match[] = { 65bd4341d61678 Suman Anna 2015-03-04 166 { .compatible = "ti,omap4-hwspinlock", }, 6fa154e282f9c8 Suman Anna 2019-05-30 167 { .compatible = "ti,am654-hwspinlock", }, 65bd4341d61678 Suman Anna 2015-03-04 168 { /* end */ }, 65bd4341d61678 Suman Anna 2015-03-04 169 }; 65bd4341d61678 Suman Anna 2015-03-04 170 MODULE_DEVICE_TABLE(of, omap_hwspinlock_of_match); 65bd4341d61678 Suman Anna 2015-03-04 171 :::::: The code at line 165 was first introduced by commit :::::: 65bd4341d61678494ea14994d0d7df73644ca014 hwspinlock/omap: add support for dt nodes :::::: TO: Suman Anna <s-anna(a)ti.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