alpha-linux-ld: drivers/spi/spi-amlogic-spifc-a4.c:289:undefined reference to `__ffsdi2'

[kernel test robot <lkp@intel.com>]

Hi Feng,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9b332cece987ee1790b2ed4c989e28162fa47860
commit: 4670db6f32e9379f5ab6c9bb2a6787cd9b9230a9 spi: amlogic: add driver for Amlogic SPI Flash Controller
date:   5 weeks ago
config: alpha-randconfig-r123-20251014 (https://download.01.org/0day-ci/archive/20251015/202510151522.iQuRChZM-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251015/202510151522.iQuRChZM-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/202510151522.iQuRChZM-lkp@intel.com/

All errors (new ones prefixed by >>):

   `xe_configfs_exit' referenced in section `.data.rel.ro' of drivers/gpu/drm/xe/xe_module.o: defined in discarded section `.exit.text' of drivers/gpu/drm/xe/xe_configfs.o
   alpha-linux-ld: drivers/spi/spi-amlogic-spifc-a4.o: in function `aml_sfc_set_bus_width':
   drivers/spi/spi-amlogic-spifc-a4.c:289:(.text+0x5ec): undefined reference to `__ffsdi2'
>> alpha-linux-ld: drivers/spi/spi-amlogic-spifc-a4.c:289:(.text+0x5f0): undefined reference to `__ffsdi2'

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