Hi Krzysztof, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d9403d307dba1a71ee6462b22300c2d3be773b1c commit: 4a9a1a5602d82c079325bf37466af0b67d6c0b9e arm64: socfpga: merge Agilex and N5X into ARCH_INTEL_SOCFPGA date: 3 months ago config: arm64-randconfig-r036-20210620 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d1baf2895467735ab14f4b3415fce204c0cc8e7f) 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... 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 ARCH=arm64 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 >>): drivers/edac/altera_edac.c:541:42: warning: unused variable 'ocramecc_data' [-Wunused-const-variable] static const struct edac_device_prv_data ocramecc_data; ^ drivers/edac/altera_edac.c:542:42: warning: unused variable 'l2ecc_data' [-Wunused-const-variable] static const struct edac_device_prv_data l2ecc_data; ^ drivers/edac/altera_edac.c:543:42: warning: unused variable 'a10_ocramecc_data' [-Wunused-const-variable] static const struct edac_device_prv_data a10_ocramecc_data; ^ drivers/edac/altera_edac.c:544:42: warning: unused variable 'a10_l2ecc_data' [-Wunused-const-variable] static const struct edac_device_prv_data a10_l2ecc_data; ^ drivers/edac/altera_edac.c:642:37: warning: unused variable 'altr_edac_device_inject_fops' [-Wunused-const-variable] static const struct file_operations altr_edac_device_inject_fops = { ^ static const struct file_operations altr_edac_a10_device_inject2_fops = { ^ 6 warnings generated. vim +/altr_edac_a10_device_inject2_fops +662 drivers/edac/altera_edac.c c7b4be8db8bc33 Thor Thayer 2016-04-06 657 064acbd4f4ab50 Thor Thayer 2018-09-25 658 static ssize_t altr_edac_a10_device_trig2(struct file *file, 064acbd4f4ab50 Thor Thayer 2018-09-25 659 const char __user *user_buf, 064acbd4f4ab50 Thor Thayer 2018-09-25 660 size_t count, loff_t *ppos); 064acbd4f4ab50 Thor Thayer 2018-09-25 661 064acbd4f4ab50 Thor Thayer 2018-09-25 @662 static const struct file_operations altr_edac_a10_device_inject2_fops = { 064acbd4f4ab50 Thor Thayer 2018-09-25 663 .open = simple_open, 064acbd4f4ab50 Thor Thayer 2018-09-25 664 .write = altr_edac_a10_device_trig2, 064acbd4f4ab50 Thor Thayer 2018-09-25 665 .llseek = generic_file_llseek, 064acbd4f4ab50 Thor Thayer 2018-09-25 666 }; 064acbd4f4ab50 Thor Thayer 2018-09-25 667 :::::: The code at line 662 was first introduced by commit :::::: 064acbd4f4ab509dd3f31e1a2d1e04a43d5b1009 EDAC, altera: Add Stratix10 peripheral support :::::: TO: Thor Thayer <thor.thayer(a)linux.intel.com&gt; :::::: CC: Borislav Petkov <bp(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org