Hi, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on v5.14-rc5] [also build test ERROR on next-20210812] [cannot apply to arm64/for-next/core tip/perf/core] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/madvenka-linux-microsoft-com/arm... base: 36a21d51725af2ce0700c6ebcb6b9594aac658a6 config: arm64-defconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 10.3.0 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://github.com/0day-ci/linux/commit/560d91e019f24a55c3d254f967eb27e4e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review madvenka-linux-microsoft-com/arm64-Make-all-stack-walking-functions-use-arch_stack_walk/20210812-222448 git checkout 560d91e019f24a55c3d254f967eb27e4ed4992e1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=arm64 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 >>): arch/arm64/kernel/perf_callchain.c: In function 'perf_callchain_kernel': 155 | arch_stack_walk(callchain_trace, entry, current, regs); | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors -- arch/arm64/kernel/process.c: In function 'get_wchan': 578 | arch_stack_walk(get_wchan_cb, &wchan_info, p, NULL); | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors -- arch/arm64/kernel/stacktrace.c:66:13: warning: no previous prototype for 'unwind_frame' [-Wmissing-prototypes] 66 | int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame) | ^~~~~~~~~~~~ arch/arm64/kernel/stacktrace.c:139:14: warning: no previous prototype for 'walk_stackframe' [-Wmissing-prototypes] 139 | void notrace walk_stackframe(struct task_struct *tsk, struct stackframe *frame, | ^~~~~~~~~~~~~~~ arch/arm64/kernel/stacktrace.c: In function 'dump_backtrace': 178 | arch_stack_walk(dump_backtrace_entry, (void *)loglvl, tsk, regs); | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors -- arch/arm64/kernel/time.c: In function 'profile_pc': 52 | arch_stack_walk(profile_pc_cb, &prof_pc, current, regs); | ^~~~~~~~~~~~~~~ arch/arm64/kernel/time.c: At top level: arch/arm64/kernel/time.c:58:13: warning: no previous prototype for 'time_init' [-Wmissing-prototypes] 58 | void __init time_init(void) | ^~~~~~~~~ cc1: some warnings being treated as errors -- arch/arm64/kernel/return_address.c: In function 'return_address': 42 | arch_stack_walk(save_return_addr, &data, current, NULL); | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/arch_stack_walk +155 arch/arm64/kernel/perf_callchain.c 146 147 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, 148 struct pt_regs *regs) 149 { 150 if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { 151 /* We don't support guest os callchain now */ 152 return; 153 } 154 156 } 157 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org