drivers/platform/x86/asus-wmi.c:464: undefined reference to `battery_hook_unregister'

[kbuild test robot]

Hi Kristian,

FYI, the error/warning still remains.

tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   574cc4539762561d96b456dbc0544d8898bd4c6e
commit: 7973353e92ee1e7ca3b2eb361a4b7cb66c92abee platform/x86: asus-wmi: Refactor charge threshold to use the battery hooking API
date:   10 days ago
config: x86_64-randconfig-e001-201937 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        git checkout 7973353e92ee1e7ca3b2eb361a4b7cb66c92abee
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   ld: drivers/platform/x86/asus-wmi.o: in function `asus_wmi_battery_exit':
>> drivers/platform/x86/asus-wmi.c:464: undefined reference to `battery_hook_unregister'
   ld: drivers/platform/x86/asus-wmi.o: in function `asus_wmi_battery_init':
>> drivers/platform/x86/asus-wmi.c:457: undefined reference to `battery_hook_register'

vim +464 drivers/platform/x86/asus-wmi.c

   451	
   452	static void asus_wmi_battery_init(struct asus_wmi *asus)
   453	{
   454		asus->battery_rsoc_available = false;
   455		if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_RSOC)) {
   456			asus->battery_rsoc_available = true;
 > 457			battery_hook_register(&battery_hook);
   458		}
   459	}
   460	
   461	static void asus_wmi_battery_exit(struct asus_wmi *asus)
   462	{
   463		if (asus->battery_rsoc_available)
 > 464			battery_hook_unregister(&battery_hook);
   465	}
   466	

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