Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on d5226fa6dbae0569ee43ecfc08bdcd6770fc4755]

url:    https://github.com/0day-ci/linux/commits/sjpark-amazon-com/Introduce-Data-Access-MONitor-DAMON/20200213-003254
base:    d5226fa6dbae0569ee43ecfc08bdcd6770fc4755
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> ERROR: "lookup_page_ext" [mm/damon.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
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