ERROR: "min_low_pfn" undefined!

[kernel test robot]

Hi Alexander,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7c30b859a947535f2213277e827d7ac7dcff9c84
commit: f220df66f67684246ae1bf4a4e479efc7c2f325a intel_th: msu-sink: An example msu buffer "sink"
date:   11 months ago
config: microblaze-randconfig-c023-20200629 (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/rpmsg/virtio_rpmsg_bus.ko] undefined!
>> ERROR: "min_low_pfn" [drivers/hwtracing/intel_th/intel_th_msu_sink.ko] undefined!
   ERROR: "min_low_pfn" [drivers/hwtracing/intel_th/intel_th_msu.ko] undefined!
   ERROR: "min_low_pfn" [drivers/mmc/core/mmc_core.ko] undefined!
   ERROR: "min_low_pfn" [drivers/md/dm-crypt.ko] undefined!
   ERROR: "min_low_pfn" [drivers/net/wireless/ath/ath6kl/ath6kl_sdio.ko] undefined!
   ERROR: "min_low_pfn" [crypto/tcrypt.ko] undefined!
   ERROR: "min_low_pfn" [crypto/asymmetric_keys/asym_tpm.ko] undefined!

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