Hi Nick, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 88b06399c9c766c283e070b022b5ceafa4f63f19 commit: fba8a8674f68a0628abae470dfcfbcb4a0d7a79e RISC-V: Add kexec support date: 2 weeks ago config: riscv-randconfig-r022-20210512 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a0fed635fe1701470062495a6ffee1c608f3f1bc) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-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 fba8a8674f68a0628abae470dfcfbcb4a0d7a79e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 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 >>): void machine_shutdown(void) ^ arch/riscv/kernel/machine_kexec.c:126:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void machine_shutdown(void) ^ static machine_crash_shutdown(struct pt_regs *regs) ^ arch/riscv/kernel/machine_kexec.c:147:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void ^ static 2 warnings generated. vim +/machine_shutdown +126 arch/riscv/kernel/machine_kexec.c 117 118 119 /* 120 * machine_shutdown - Prepare for a kexec reboot 121 * 122 * This function is called by kernel_kexec just before machine_kexec 123 * below. Its goal is to prepare the rest of the system (the other 124 * harts and possibly devices etc) for a kexec reboot. 125 */ 127 { 128 /* 129 * No more interrupts on this hart 130 * until we are back up. 131 */ 132 local_irq_disable(); 133 134 #if defined(CONFIG_HOTPLUG_CPU) 135 smp_shutdown_nonboot_cpus(smp_processor_id()); 136 #endif 137 } 138 139 /** 140 * machine_crash_shutdown - Prepare to kexec after a kernel crash 141 * 142 * This function is called by crash_kexec just before machine_kexec 143 * below and its goal is similar to machine_shutdown, but in case of 144 * a kernel crash. Since we don't handle such cases yet, this function 145 * is empty. 146 */ 147 void 149 { 150 } 151 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org