ERROR: "min_low_pfn" undefined!

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7c30b859a947535f2213277e827d7ac7dcff9c84
commit: ec4ba01e894d3165e4d1ccbef782ef5593b708b4 mtd: rawnand: Add new Cadence NAND driver to MTD subsystem
date:   9 months ago
config: microblaze-randconfig-c004-20200629 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0

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

All errors (new ones prefixed by >>):

   ERROR: "min_low_pfn" [drivers/ntb/ntb_transport.ko] undefined!
>> ERROR: "min_low_pfn" [drivers/mtd/nand/raw/cadence-nand-controller.ko] undefined!
   ERROR: "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@xxxxxxxxxxxx

Attachment: .config.gz
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