[intel-tdx:guest-kexec 1/8] arch/x86/kernel/acpi/boot.c:1186:2: error: call to undeclared function 'cpu_hotplug_not_supported'; ISO C99 and later do not support implicit function declarations

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/intel/tdx.git guest-kexec
head:   7d7a8fcef30fe2515b3cce811bd7b96a14e2a75f
commit: 602cc233a076ee5e78eb0bf5bc5e0519ecc15676 [1/8] cpu/hotplug, x86/acpi: Disable CPU hotplug for ACPI MADT wakeup
config: x86_64-randconfig-073-20230823 (https://download.01.org/0day-ci/archive/20230823/202308232008.WJtnOzai-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce: (https://download.01.org/0day-ci/archive/20230823/202308232008.WJtnOzai-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308232008.WJtnOzai-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/kernel/acpi/boot.c:1186:2: error: call to undeclared function 'cpu_hotplug_not_supported'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           cpu_hotplug_not_supported();
           ^
   1 error generated.


vim +/cpu_hotplug_not_supported +1186 arch/x86/kernel/acpi/boot.c

  1167	
  1168	#ifdef CONFIG_X86_64
  1169	static int __init acpi_parse_mp_wake(union acpi_subtable_headers *header,
  1170					     const unsigned long end)
  1171	{
  1172		struct acpi_madt_multiproc_wakeup *mp_wake;
  1173	
  1174		if (!IS_ENABLED(CONFIG_SMP))
  1175			return -ENODEV;
  1176	
  1177		mp_wake = (struct acpi_madt_multiproc_wakeup *)header;
  1178		if (BAD_MADT_ENTRY(mp_wake, end))
  1179			return -EINVAL;
  1180	
  1181		acpi_table_print_madt_entry(&header->common);
  1182	
  1183		acpi_mp_wake_mailbox_paddr = mp_wake->base_address;
  1184	
  1185		/* Disable CPU onlining/offlining */
> 1186		cpu_hotplug_not_supported();
  1187	
  1188		acpi_wake_cpu_handler_update(acpi_wakeup_cpu);
  1189	
  1190		return 0;
  1191	}
  1192	#endif				/* CONFIG_X86_64 */
  1193	#endif				/* CONFIG_X86_LOCAL_APIC */
  1194	

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