tree:   https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-nomadik.git ux500-skomer-v5.11-rc1
head:   9576d8e150530c5a4f2258e60c94f3dd1fd0c7ff
commit: c35889819d0b03a28de38227f772bb74922d7fc2 [6/7] leds: rt8515: Add Richtek RT8515 LED driver
config: nios2-randconfig-c003-20201228 (attached as .config)
compiler: nios2-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/linusw/linux-nomadik.git/commit/?id=c35889819d0b03a28de38227f772bb74922d7fc2
        git remote add nomadik https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-nomadik.git
        git fetch --no-tags nomadik ux500-skomer-v5.11-rc1
        git checkout c35889819d0b03a28de38227f772bb74922d7fc2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 

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 >>):

   nios2-linux-ld: drivers/leds/flash/leds-rt8515.o: in function `rt8515_remove':
>> leds-rt8515.c:(.text+0x30): undefined reference to `v4l2_flash_release'
   leds-rt8515.c:(.text+0x30): relocation truncated to fit: R_NIOS2_CALL26 against `v4l2_flash_release'
   nios2-linux-ld: drivers/leds/flash/leds-rt8515.o: in function `rt8515_probe':
>> leds-rt8515.c:(.text+0x5a8): undefined reference to `v4l2_flash_init'
   leds-rt8515.c:(.text+0x5a8): relocation truncated to fit: R_NIOS2_CALL26 against `v4l2_flash_init'

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