tree:   https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.10
head:   370c019298b937a0e4f65756f8297af5194a41db
commit: 95e15e098b0dd8fcdfcb42abd1e5fd22d06311f7 [17159/17821] UPSTREAM: drm: Add simpledrm driver
config: arm-randconfig-r005-20210725 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 10.3.0
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
        git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel
        git fetch --no-tags chrome-os chromeos-5.10
        git checkout 95e15e098b0dd8fcdfcb42abd1e5fd22d06311f7
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash

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 >>):

>> arm-linux-gnueabi-ld: drivers/video/fbdev/simplefb.o:(.rodata+0x3c): undefined reference to `cfb_fillrect'
>> arm-linux-gnueabi-ld: drivers/video/fbdev/simplefb.o:(.rodata+0x40): undefined reference to `cfb_copyarea'
>> arm-linux-gnueabi-ld: drivers/video/fbdev/simplefb.o:(.rodata+0x44): undefined reference to `cfb_imageblit'

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