[matwey:bbb-3.8-3.9 160/312] drivers/acpi/processor_driver.c:645:2: error: implicit declaration of function 'try_offline_node'

tree:   https://github.com/matwey/linux bbb-3.8-3.9
head:   f24c5d4dc718b210b6a2d874187f43e63b99d162
commit: 05c2105e30f5c2d8cb486ff5fd20059b401ddbb9 [160/312] cpu-hotplug, memory-hotplug: try offlining the node when hotremoving a cpu
config: i386-randconfig-a1-201804 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 05c2105e30f5c2d8cb486ff5fd20059b401ddbb9
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/acpi/processor_driver.c: In function 'acpi_processor_remove':

quoted

drivers/acpi/processor_driver.c:645:2: error: implicit declaration of function 'try_offline_node' [-Werror=implicit-function-declaration]

     try_offline_node(cpu_to_node(pr->id));
     ^
   cc1: some warnings being treated as errors

vim +/try_offline_node +645 drivers/acpi/processor_driver.c

   613	
   614	static int acpi_processor_remove(struct acpi_device *device)
   615	{
   616		struct acpi_processor *pr = NULL;
   617	
   618	
   619		if (!device || !acpi_driver_data(device))
   620			return -EINVAL;
   621	
   622		pr = acpi_driver_data(device);
   623	
   624		if (pr->id >= nr_cpu_ids)
   625			goto free;
   626	
   627		if (device->removal_type == ACPI_BUS_REMOVAL_EJECT) {
   628			if (acpi_processor_handle_eject(pr))
   629				return -EINVAL;
   630		}
   631	
   632		acpi_processor_power_exit(pr);
   633	
   634		sysfs_remove_link(&device->dev.kobj, "sysdev");
   635	
   636		if (pr->cdev) {
   637			sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
   638			sysfs_remove_link(&pr->cdev->device.kobj, "device");
   639			thermal_cooling_device_unregister(pr->cdev);
   640			pr->cdev = NULL;
   641		}
   642	
   643		per_cpu(processors, pr->id) = NULL;
   644		per_cpu(processor_device_array, pr->id) = NULL;
 > 645		try_offline_node(cpu_to_node(pr->id));
   646	
   647	free:
   648		free_cpumask_var(pr->throttling.shared_cpu_map);
   649		kfree(pr);
   650	
   651		return 0;
   652	}
   653	

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