[pdx86-platform-drivers-x86:review-hans 77/100] ERROR: modpost: "battery_hook_register" [drivers/platform/x86/system76_acpi.ko] undefined!

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git review-hans
head:   fc3341b4b55f46ad0846a22ae149d94bac6ce40b
commit: 76f7eba3e0a248af4cc4f302d95031fa2fb65fab [77/100] platform/x86: system76_acpi: Add battery charging thresholds
config: i386-randconfig-a013-20211019 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/commit/?id=76f7eba3e0a248af4cc4f302d95031fa2fb65fab
        git remote add pdx86-platform-drivers-x86 https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git
        git fetch --no-tags pdx86-platform-drivers-x86 review-hans
        git checkout 76f7eba3e0a248af4cc4f302d95031fa2fb65fab
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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

Note: the pdx86-platform-drivers-x86/review-hans HEAD fc3341b4b55f46ad0846a22ae149d94bac6ce40b builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "battery_hook_register" [drivers/platform/x86/system76_acpi.ko] undefined!
>> ERROR: modpost: "battery_hook_unregister" [drivers/platform/x86/system76_acpi.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
Description: application/gzip