Hi Krzysztof, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: e48661230cc35b3d0f4367eddfc19f86463ab917 commit: 4a9a1a5602d82c079325bf37466af0b67d6c0b9e arm64: socfpga: merge Agilex and N5X into ARCH_INTEL_SOCFPGA date: 6 weeks ago config: arm64-randconfig-r016-20210507 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a3a8a1a15b524d91b5308db68e9d293b34cd88dd) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4a9a1a5602d82c079325bf37466af0b67d6c0b9e git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 4a9a1a5602d82c079325bf37466af0b67d6c0b9e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/reset/reset-a10sr.c:111:34: warning: unused variable 'a10sr_reset_of_match' [-Wunused-const-variable] static const struct of_device_id a10sr_reset_of_match[] = { ^ 1 warning generated. vim +/a10sr_reset_of_match +111 drivers/reset/reset-a10sr.c 627006820268f9 Thor Thayer 2017-02-22 110 627006820268f9 Thor Thayer 2017-02-22 @111 static const struct of_device_id a10sr_reset_of_match[] = { 627006820268f9 Thor Thayer 2017-02-22 112 { .compatible = "altr,a10sr-reset" }, 627006820268f9 Thor Thayer 2017-02-22 113 { }, 627006820268f9 Thor Thayer 2017-02-22 114 }; 627006820268f9 Thor Thayer 2017-02-22 115 MODULE_DEVICE_TABLE(of, a10sr_reset_of_match); 627006820268f9 Thor Thayer 2017-02-22 116 :::::: The code at line 111 was first introduced by commit :::::: 627006820268f92b62b2bde486c76ccd0fadb671 reset: Add Altera Arria10 SR Reset Controller :::::: TO: Thor Thayer :::::: CC: Philipp Zabel --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org