tree: https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next head: 14512690a16537527dacf0f5cd3d2263be317f35 commit: 7b9dbbb41e1e6579d21fbec1d85ed04a392f73e9 [24/25] riscv: add VMAP_STACK overflow detection 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 # https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git/commit/?i... git remote add riscv https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git git fetch --no-tags riscv for-next git checkout 7b9dbbb41e1e6579d21fbec1d85ed04a392f73e9 # 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 >>): 210 | asmlinkage unsigned long get_overflow_stack(void) | ^~~~~~~~~~~~~~~~~~ 216 | asmlinkage void handle_bad_stack(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~ vim +/get_overflow_stack +210 arch/riscv/kernel/traps.c 201 202 #ifdef CONFIG_VMAP_STACK 203 DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack) 204 __aligned(16); 205 /* 206 * shadow stack, handled_ kernel_ stack_ overflow(in kernel/entry.S) is used 207 * to get per-cpu overflow stack(get_overflow_stack). 208 */ 209 long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)]; 211 { 212 return (unsigned long)this_cpu_ptr(overflow_stack) + 213 OVERFLOW_STACK_SIZE; 214 } 215 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org