CC: linux-kernel(a)vger.kernel.org TO: Nathan Huckleberry <nhuck15(a)gmail.com&gt; CC: Russell King <rmk+kernel(a)armlinux.org.uk&gt; CC: Nick Desaulniers <ndesaulniers(a)google.com&gt; Hi Nathan, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f8456690ba8eb18ea4714e68554e242a04f65cff commit: 6dc5fd93b2f1ef75d5e50fced8cb193811f25f22 ARM: 8900/1: UNWINDER_FRAME_POINTER implementation for Clang date: 11 months ago config: arm-randconfig-r026-20200716 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed6b578040a85977026c93bf4188f996148f3218) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi git checkout 6dc5fd93b2f1ef75d5e50fced8cb193811f25f22 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org