Hi Masami, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y head: 5a3ba2f90f8789162a03e07a37224bab4c643d1d commit: d3380de483d55d904fb94a241406b34ed2fada7d [1864/4040] ia64: kprobes: Use generic kretprobe trampoline handler config: ia64-allmodconfig (attached as .config) compiler: ia64-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://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.19.y git checkout d3380de483d55d904fb94a241406b34ed2fada7d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=ia64 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/ia64/kernel/kprobes.c: In function 'get_kprobe_inst': arch/ia64/kernel/kprobes.c:338:15: warning: variable 'template' set but not used [-Wunused-but-set-variable] 338 | unsigned int template; | ^~~~~~~~ arch/ia64/kernel/kprobes.c: At top level: arch/ia64/kernel/kprobes.c:412:15: warning: no previous prototype for 'trampoline_probe_handler' [-Wmissing-prototypes] 412 | int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~~~~ arch/ia64/kernel/kprobes.c: In function 'trampoline_probe_handler': 414 | regs->cr_iip = __kretprobe_trampoline_handler(regs, kretprobe_trampoline, NULL); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | kretprobe_trampoline At top level: arch/ia64/kernel/kprobes.c:928:13: warning: 'ia64_get_bsp_cfm' defined but not used [-Wunused-function] 928 | static void ia64_get_bsp_cfm(struct unw_frame_info *info, void *arg) | ^~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for FRAME_POINTER Depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS Selected by - FAULT_INJECTION_STACKTRACE_FILTER && FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT && !X86_64 && !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC && !X86 vim +414 arch/ia64/kernel/kprobes.c 411 412 int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) 413 { 415 /* 416 * By returning a non-zero value, we are telling 417 * kprobe_handler() that we don't want the post_handler 418 * to run (and have re-enabled preemption) 419 */ 420 return 1; 421 } 422 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org