Hi Wang, Thank you for the patch! Yet something to improve: [auto build test ERROR on next-20200611] [cannot apply to arm64/for-next/core arm-perf/for-next/perf soc/for-next arm/for-next xlnx/master kvmarm/next v5.7 v5.7-rc7 v5.7-rc6 v5.7] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Wang-Qing/arm64-smp-call-when-ta... base: 192e08e14e37b78e83cc2f5b9eb5a15a7d71c4e2 config: arm64-allyesconfig (attached as .config) compiler: aarch64-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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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 >>, old ones prefixed by <<): arch/arm64/kernel/traps.c: In function 'dump_backtrace': 119 | smp_call_function_single(tsk->cpu, dump_backtrace_fun, tsk, 0); | ^~~~~~~~~~~~~~~~~~ | dump_backtrace_smp_fun arch/arm64/kernel/traps.c:119:38: note: each undeclared identifier is reported only once for each function it appears in arch/arm64/kernel/traps.c: At top level: arch/arm64/kernel/traps.c:768:26: warning: initialized field overwritten [-Woverride-init] 768 | [ESR_ELx_EC_UNKNOWN] = "Unknown/Uncategorized", | ^~~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:768:26: note: (near initialization for 'esr_class_str[0]') arch/arm64/kernel/traps.c:769:22: warning: initialized field overwritten [-Woverride-init] 769 | [ESR_ELx_EC_WFx] = "WFI/WFE", | ^~~~~~~~~ arch/arm64/kernel/traps.c:769:22: note: (near initialization for 'esr_class_str[1]') arch/arm64/kernel/traps.c:770:26: warning: initialized field overwritten [-Woverride-init] 770 | [ESR_ELx_EC_CP15_32] = "CP15 MCR/MRC", | ^~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:770:26: note: (near initialization for 'esr_class_str[3]') arch/arm64/kernel/traps.c:771:26: warning: initialized field overwritten [-Woverride-init] 771 | [ESR_ELx_EC_CP15_64] = "CP15 MCRR/MRRC", | ^~~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:771:26: note: (near initialization for 'esr_class_str[4]') arch/arm64/kernel/traps.c:772:26: warning: initialized field overwritten [-Woverride-init] 772 | [ESR_ELx_EC_CP14_MR] = "CP14 MCR/MRC", | ^~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:772:26: note: (near initialization for 'esr_class_str[5]') arch/arm64/kernel/traps.c:773:26: warning: initialized field overwritten [-Woverride-init] 773 | [ESR_ELx_EC_CP14_LS] = "CP14 LDC/STC", | ^~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:773:26: note: (near initialization for 'esr_class_str[6]') arch/arm64/kernel/traps.c:774:27: warning: initialized field overwritten [-Woverride-init] 774 | [ESR_ELx_EC_FP_ASIMD] = "ASIMD", | ^~~~~~~ arch/arm64/kernel/traps.c:774:27: note: (near initialization for 'esr_class_str[7]') arch/arm64/kernel/traps.c:775:26: warning: initialized field overwritten [-Woverride-init] 775 | [ESR_ELx_EC_CP10_ID] = "CP10 MRC/VMRS", | ^~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:775:26: note: (near initialization for 'esr_class_str[8]') arch/arm64/kernel/traps.c:776:22: warning: initialized field overwritten [-Woverride-init] 776 | [ESR_ELx_EC_PAC] = "PAC", | ^~~~~ arch/arm64/kernel/traps.c:776:22: note: (near initialization for 'esr_class_str[9]') arch/arm64/kernel/traps.c:777:26: warning: initialized field overwritten [-Woverride-init] 777 | [ESR_ELx_EC_CP14_64] = "CP14 MCRR/MRRC", | ^~~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:777:26: note: (near initialization for 'esr_class_str[12]') arch/arm64/kernel/traps.c:778:22: warning: initialized field overwritten [-Woverride-init] 778 | [ESR_ELx_EC_BTI] = "BTI", | ^~~~~ arch/arm64/kernel/traps.c:778:22: note: (near initialization for 'esr_class_str[13]') arch/arm64/kernel/traps.c:779:22: warning: initialized field overwritten [-Woverride-init] 779 | [ESR_ELx_EC_ILL] = "PSTATE.IL", | ^~~~~~~~~~~ arch/arm64/kernel/traps.c:779:22: note: (near initialization for 'esr_class_str[14]') arch/arm64/kernel/traps.c:780:24: warning: initialized field overwritten [-Woverride-init] 780 | [ESR_ELx_EC_SVC32] = "SVC (AArch32)", | ^~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:780:24: note: (near initialization for 'esr_class_str[17]') arch/arm64/kernel/traps.c:781:24: warning: initialized field overwritten [-Woverride-init] 781 | [ESR_ELx_EC_HVC32] = "HVC (AArch32)", | ^~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:781:24: note: (near initialization for 'esr_class_str[18]') arch/arm64/kernel/traps.c:782:24: warning: initialized field overwritten [-Woverride-init] 782 | [ESR_ELx_EC_SMC32] = "SMC (AArch32)", | ^~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:782:24: note: (near initialization for 'esr_class_str[19]') arch/arm64/kernel/traps.c:783:24: warning: initialized field overwritten [-Woverride-init] 783 | [ESR_ELx_EC_SVC64] = "SVC (AArch64)", | ^~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:783:24: note: (near initialization for 'esr_class_str[21]') arch/arm64/kernel/traps.c:784:24: warning: initialized field overwritten [-Woverride-init] 784 | [ESR_ELx_EC_HVC64] = "HVC (AArch64)", | ^~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:784:24: note: (near initialization for 'esr_class_str[22]') arch/arm64/kernel/traps.c:785:24: warning: initialized field overwritten [-Woverride-init] 785 | [ESR_ELx_EC_SMC64] = "SMC (AArch64)", | ^~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:785:24: note: (near initialization for 'esr_class_str[23]') arch/arm64/kernel/traps.c:786:24: warning: initialized field overwritten [-Woverride-init] 786 | [ESR_ELx_EC_SYS64] = "MSR/MRS (AArch64)", | ^~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:786:24: note: (near initialization for 'esr_class_str[24]') arch/arm64/kernel/traps.c:787:22: warning: initialized field overwritten [-Woverride-init] 787 | [ESR_ELx_EC_SVE] = "SVE", | ^~~~~ arch/arm64/kernel/traps.c:787:22: note: (near initialization for 'esr_class_str[25]') arch/arm64/kernel/traps.c:788:23: warning: initialized field overwritten [-Woverride-init] 788 | [ESR_ELx_EC_ERET] = "ERET/ERETAA/ERETAB", | ^~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:788:23: note: (near initialization for 'esr_class_str[26]') arch/arm64/kernel/traps.c:789:26: warning: initialized field overwritten [-Woverride-init] 789 | [ESR_ELx_EC_IMP_DEF] = "EL3 IMP DEF", | ^~~~~~~~~~~~~ arch/arm64/kernel/traps.c:789:26: note: (near initialization for 'esr_class_str[31]') arch/arm64/kernel/traps.c:790:27: warning: initialized field overwritten [-Woverride-init] 790 | [ESR_ELx_EC_IABT_LOW] = "IABT (lower EL)", | ^~~~~~~~~~~~~~~~~ arch/arm64/kernel/traps.c:790:27: note: (near initialization for 'esr_class_str[32]') arch/arm64/kernel/traps.c:791:27: warning: initialized field overwritten [-Woverride-init] 791 | [ESR_ELx_EC_IABT_CUR] = "IABT (current EL)", | ^~~~~~~~~~~~~~~~~~~ vim +119 arch/arm64/kernel/traps.c 90 91 void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk, 92 const char *loglvl) 93 { 94 struct stackframe frame; 95 int skip = 0; 96 97 pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk); 98 99 if (regs) { 100 if (user_mode(regs)) 101 return; 102 skip = 1; 103 } 104 105 if (!tsk) 106 tsk = current; 107 108 if (!try_get_task_stack(tsk)) 109 return; 110 111 if (tsk == current) { 112 start_backtrace(&frame, 113 (unsigned long)__builtin_frame_address(0), 114 (unsigned long)dump_backtrace); 115 } else if (task_curr(tsk)) { 116 /* 117 * The task is currently running on other cpu 118 */ 120 return; 121 } else { 122 /* 123 * task blocked in __switch_to 124 */ 125 start_backtrace(&frame, 126 thread_saved_fp(tsk), 127 thread_saved_pc(tsk)); 128 } 129 130 printk("%sCall trace:\n", loglvl); 131 do { 132 /* skip until specified stack frame */ 133 if (!skip) { 134 dump_backtrace_entry(frame.pc, loglvl); 135 } else if (frame.fp == regs->regs[29]) { 136 skip = 0; 137 /* 138 * Mostly, this is the case where this function is 139 * called in panic/abort. As exception handler's 140 * stack frame does not contain the corresponding pc 141 * at which an exception has taken place, use regs->pc 142 * instead. 143 */ 144 dump_backtrace_entry(regs->pc, loglvl); 145 } 146 } while (!unwind_frame(tsk, &frame)); 147 148 put_task_stack(tsk); 149 } 150 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org