ld.lld: error: undefined symbol: led_classdev_multicolor_unregister

ld.lld: error: undefined symbol: led_classdev_multicolor_unregister

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b5a051f6b840d48f159166ef073d3021989bfb50
commit: 721d90c8509aee195c3714b70c4cff612fbb3a1c wifi: rtw89: add multicolor LED support for RTL8852CU valve board
date:   8 weeks ago
config: hexagon-randconfig-r072-20260915 (https://download.01.org/0day-ci/archive/20260917/202609172315.ZYoKvKBS-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
smatch: v0.5.0-9187-g5189e3fb
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260917/202609172315.ZYoKvKBS-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Fixes: 721d90c8509a ("wifi: rtw89: add multicolor LED support for RTL8852CU valve board")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609172315.ZYoKvKBS-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: led_classdev_multicolor_register_ext
   >>> referenced by led_mc.c:67 (drivers/net/wireless/realtek/rtw89/led_mc.c:67)
   >>>               drivers/net/wireless/realtek/rtw89/led_mc.o:(rtw89_led_mc_init) in archive vmlinux.a
   >>> referenced by led_mc.c:67 (drivers/net/wireless/realtek/rtw89/led_mc.c:67)
   >>>               drivers/net/wireless/realtek/rtw89/led_mc.o:(rtw89_led_mc_init) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: led_classdev_multicolor_unregister
   >>> referenced by led_mc.c:80 (drivers/net/wireless/realtek/rtw89/led_mc.c:80)
   >>>               drivers/net/wireless/realtek/rtw89/led_mc.o:(rtw89_led_mc_deinit) in archive vmlinux.a
   >>> referenced by led_mc.c:80 (drivers/net/wireless/realtek/rtw89/led_mc.c:80)
   >>>               drivers/net/wireless/realtek/rtw89/led_mc.o:(rtw89_led_mc_deinit) in archive vmlinux.a

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

RE: ld.lld: error: undefined symbol: led_classdev_multicolor_unregister

[Ping-Ke Shih]

kernel test robot <lkp@intel.com> wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   b5a051f6b840d48f159166ef073d3021989bfb50
> commit: 721d90c8509aee195c3714b70c4cff612fbb3a1c wifi: rtw89: add multicolor LED support for RTL8852CU
> valve board
> date:   8 weeks ago
> config: hexagon-randconfig-r072-20260915
> (https://download.01.org/0day-ci/archive/20260917/202609172315.ZYoKvKBS-lkp@intel.com/config)
> compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project
> 6009708b4367171ccdbf4b5905cb6a803753fe18)
> smatch: v0.5.0-9187-g5189e3fb
> reproduce (this is a W=1 build):
> (https://download.01.org/0day-ci/archive/20260917/202609172315.ZYoKvKBS-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Fixes: 721d90c8509a ("wifi: rtw89: add multicolor LED support for RTL8852CU valve board")
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202609172315.ZYoKvKBS-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
> >> ld.lld: error: undefined symbol: led_classdev_multicolor_register_ext

Thanks for the report. This is because multicolor is kernel module

  CONFIG_LEDS_CLASS_MULTICOLOR=m

but rtw89 is built-in

  CONFIG_RTW89=y
  CONFIG_RTW89_LEDS_MC=y

Correct the dependency in Kconfig to avoid this case. [1]

[1] https://lore.kernel.org/linux-wireless/20260918021113.25481-1-pkshih@realtek.com/T/#u