Hi Anshuman,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8b6ddd10d678bebec32381f71b6b420bafc43ad0
commit: c62da0c35d58518ddb26ff641d2485596567fd96 mm/vma: define a default value for VM_DATA_DEFAULT_FLAGS
date:   2 months ago
config: microblaze-randconfig-r025-20200621 (attached as .config)
compiler: microblaze-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
        git checkout c62da0c35d58518ddb26ff641d2485596567fd96
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 

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 >>, old ones prefixed by <<):

>> ERROR: modpost: "min_low_pfn" [drivers/mtd/nand/raw/cadence-nand-controller.ko] undefined!
>> ERROR: modpost: "min_low_pfn" [drivers/mtd/nand/raw/nand.ko] undefined!

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