tree: https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next head: 04d2b1ac88e94574429a62839bc0e982cebb854c commit: f85daef543eb3e98e28905ddb813151443911571 [11/12] RISC-V: Add kexec support config: riscv-allyesconfig (attached as .config) compiler: riscv64-linux-gcc (GCC) 9.3.0 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 git checkout f85daef543eb3e98e28905ddb813151443911571 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross 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 >>): In file included from include/linux/kexec.h:28, from arch/riscv/kernel/machine_kexec.c:7: 38 | const extern unsigned char riscv_kexec_relocate[]; | ^~~~~ arch/riscv/include/asm/kexec.h:39:1: warning: 'extern' is not at beginning of declaration [-Wold-style-declaration] 39 | const extern unsigned int riscv_kexec_relocate_size; | ^~~~~ 128 | void machine_shutdown(void) | ^~~~~~~~~~~~~~~~ 150 | machine_crash_shutdown(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~~ vim +/extern +38 arch/riscv/include/asm/kexec.h 37 39 const extern unsigned int riscv_kexec_relocate_size; 40 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org