Hi Lizhi,

I love your patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on linus/master v5.11 next-20210218]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Lizhi-Hou/XRT-Alveo-driver-overview/20210218-151631
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2ab38c17aac10bf55ab3efde4c4db3893d8691d2
config: arm-allyesconfig (attached as .config)
compiler: arm-linux-gnueabi-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://github.com/0day-ci/linux/commit/9069f42b5fcafe471ceb1047ee53983098b2edba
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Lizhi-Hou/XRT-Alveo-driver-overview/20210218-151631
        git checkout 9069f42b5fcafe471ceb1047ee53983098b2edba
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: drivers/fpga/xrt/lib/xleaf/clock.o: in function `get_freq':

quoted

clock.c:(.text+0x228): undefined reference to `__aeabi_uldivmod'

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