undefined reference to `led_classdev_unregister'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f40ddce88593482919761f74910f42f4b84c004b
commit: 72cdab808714b1ec24b0c7bdebed163ce791f01f ath9k: Do not select MAC80211_LEDS by default
date:   6 months ago
config: parisc-randconfig-r002-20210218 (attached as .config)
compiler: hppa64-linux-gcc (GCC) 9.3.0
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/torvalds/linux.git/commit/?id=72cdab808714b1ec24b0c7bdebed163ce791f01f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 72cdab808714b1ec24b0c7bdebed163ce791f01f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 

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

All errors (new ones prefixed by >>):

   hppa64-linux-ld: drivers/net/wireless/ath/ath9k/gpio.o: in function `.LC54':
>> (.data.rel.ro+0xe8): undefined reference to `led_classdev_unregister'
   hppa64-linux-ld: drivers/net/wireless/ath/ath9k/gpio.o: in function `.LC64':
>> (.data.rel.ro+0x120): undefined reference to `led_classdev_register_ext'

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

Attachment: .config.gz
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