Hi, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.8-rc4 next-20200709] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/guoren-kernel-org/riscv-Add-STAC... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0bddd227f3dc55975e2b8dfa7fc6f959b062a2c7 config: riscv-randconfig-s031-20200709 (attached as .config) compiler: riscv32-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-37-gc9676a3b-dirty # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' 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/stackprotector.h:10, from arch/riscv/kernel/process.c:28: arch/riscv/include/asm/stackprotector.h: In function 'boot_init_stack_canary': >> arch/riscv/include/asm/stackprotector.h:26:23: warning: left shift count >= width of type [-Wshift-count-overflow] 26 | canary += tsc + (tsc << 32UL); | ^~ arch/riscv/kernel/process.c: At top level: arch/riscv/kernel/process.c:42:6: warning: no previous prototype for 'show_regs' [-Wmissing-prototypes] 42 | void show_regs(struct pt_regs *regs) | ^~~~~~~~~ arch/riscv/kernel/process.c:103:5: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes] 103 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) | ^~~~~~~~~~~~~~~~~~~~ vim +26 arch/riscv/include/asm/stackprotector.h 11 12 /* 13 * Initialize the stackprotector canary value. 14 * 15 * NOTE: this must only be called from functions that never return, 16 * and it must always be inlined. 17 */ 18 static __always_inline void boot_init_stack_canary(void) 19 { 20 unsigned long canary; 21 unsigned long tsc; 22 23 /* Try to get a semi random initial value. */ 24 get_random_bytes(&canary, sizeof(canary)); 25 tsc = get_cycles(); > 26 canary += tsc + (tsc << 32UL); --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org