[linux-next:master 3400/4731] ld.lld: error: undefined symbol: mbox_free_channel

[linux-next:master 3400/4731] ld.lld: error: undefined symbol: mbox_free_channel

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   f9ba12abc5282bf992f9a9ae87ad814fd03a0270
commit: 1ff1f0db6aec80eae1639eff31b5875632d539c0 [3400/4731] pmdomain: mediatek: Add support for MFlexGraphics
config: arm64-randconfig-003-20251030 (https://download.01.org/0day-ci/archive/20251030/202510301311.TcOCnZ1s-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251030/202510301311.TcOCnZ1s-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
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510301311.TcOCnZ1s-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: mbox_free_channel
   >>> referenced by mtk-mfg-pmdomain.c:998 (drivers/pmdomain/mediatek/mtk-mfg-pmdomain.c:998)
   >>>               vmlinux.o:(mtk_mfg_probe)
   >>> referenced by mtk-mfg-pmdomain.c:1000 (drivers/pmdomain/mediatek/mtk-mfg-pmdomain.c:1000)
   >>>               vmlinux.o:(mtk_mfg_probe)
   >>> referenced by mtk-mfg-pmdomain.c:1024 (drivers/pmdomain/mediatek/mtk-mfg-pmdomain.c:1024)
   >>>               vmlinux.o:(mtk_mfg_remove)
   >>> referenced 2 more times
--
>> ld.lld: error: undefined symbol: mbox_request_channel_byname
   >>> referenced by mtk-mfg-pmdomain.c:816 (drivers/pmdomain/mediatek/mtk-mfg-pmdomain.c:816)
   >>>               vmlinux.o:(mtk_mfg_init_mbox)
   >>> referenced by mtk-mfg-pmdomain.c:831 (drivers/pmdomain/mediatek/mtk-mfg-pmdomain.c:831)
   >>>               vmlinux.o:(mtk_mfg_init_mbox)

-- 
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https://github.com/intel/lkp-tests/wiki