[hid:for-5.18/apple 6/8] csky-linux-ld: hid-apple.c:undefined reference to `devm_led_classdev_register_ext'

[hid:for-5.18/apple 6/8] csky-linux-ld: hid-apple.c:undefined reference to `devm_led_classdev_register_ext'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git for-5.18/apple
head:   c5f09b1b45cbb90147846f82ec0489789c99667e
commit: 9018eacbe623b2c3535da37035e5f22d3d70b6ce [6/8] HID: apple: Add support for keyboard backlight on certain T2 Macs.
config: csky-defconfig (https://download.01.org/0day-ci/archive/20220217/202202170730.8pPvrRAz-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git/commit/?id=9018eacbe623b2c3535da37035e5f22d3d70b6ce
        git remote add hid https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git
        git fetch --no-tags hid for-5.18/apple
        git checkout 9018eacbe623b2c3535da37035e5f22d3d70b6ce
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=csky SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   csky-linux-ld: drivers/hid/hid-apple.o: in function `apple_backlight_init.isra.0':
   hid-apple.c:(.text+0x2e6): undefined reference to `devm_led_classdev_register_ext'
>> csky-linux-ld: hid-apple.c:(.text+0x33c): undefined reference to `devm_led_classdev_register_ext'

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