Hi Pingfan, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [cannot apply to v5.3-rc3 next-20190807] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Pingfan-Liu/x86-mce-protect-nr_cpus-from-rebooting-by-broadcast-mce/20190806-101748 config: i386-randconfig-a004-201931 (attached as .config) compiler: gcc-4.9 (Debian 4.9.2-10+deb8u1) 4.9.2 reproduce: # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): ld: arch/x86/kernel/smpboot.o: in function `do_stable_cpu': >> arch/x86/kernel/smpboot.c:1057: undefined reference to `initial_gs' vim +1057 arch/x86/kernel/smpboot.c 1048 1049 static void __init do_stable_cpu(int cpu) 1050 { 1051 static char capped_tmp_stack[512]; 1052 int cpu0_nmi_registered = 0, apicid = cpuid_to_apicid[cpu]; 1053 unsigned long start_ip = real_mode_header->trampoline_start; 1054 unsigned long timeout, boot_error = 0; 1055 1056 /* invalid percpu area */ > 1057 initial_gs = 0; 1058 /* 1059 * Borrow the value of cpu 0. Since capped cpu segment shadow register 1060 * can cache the content, and keep it unchanged. 1061 */ 1062 early_gdt_descr.address = (unsigned long)get_cpu_gdt_rw(0); 1063 initial_code = (unsigned long)make_capped_cpu_stable; 1064 initial_stack = (unsigned long)&capped_tmp_stack; 1065 1066 if (apic->wakeup_secondary_cpu) 1067 boot_error = apic->wakeup_secondary_cpu(apicid, start_ip); 1068 else 1069 boot_error = wakeup_cpu_via_init_nmi(cpu, start_ip, apicid, 1070 &cpu0_nmi_registered); 1071 if (cpu0_nmi_registered) 1072 unregister_nmi_handler(NMI_LOCAL, "wake_cpu0"); 1073 1074 if (!boot_error) { 1075 /* Wait 10s total for first sign of life from capped cpu */ 1076 boot_error = -1; 1077 timeout = jiffies + 10*HZ; 1078 while (time_before(jiffies, timeout)) { 1079 if (cpumask_test_cpu(cpu, cpu_capped_done_mask)) 1080 break; 1081 schedule(); 1082 } 1083 } 1084 } 1085 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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