Hi Ard,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b51594df17d0ce80b9f9f35394a1f42d7ac94472
commit: be1eb7f78aa8fbe34779c56c266ccd0364604e71 crypto: essiv - create wrapper template for ESSIV generation
date:   12 months ago
config: microblaze-randconfig-r003-20200831 (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 be1eb7f78aa8fbe34779c56c266ccd0364604e71
        # 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 >>):

   ERROR: "min_low_pfn" [net/mac80211/mac80211.ko] undefined!
   ERROR: "min_low_pfn" [drivers/mtd/nand/raw/nand.ko] undefined!
   ERROR: "min_low_pfn" [drivers/ntb/ntb_transport.ko] undefined!
>> ERROR: "min_low_pfn" [crypto/essiv.ko] undefined!
   ERROR: "min_low_pfn" [crypto/tcrypt.ko] undefined!
   ERROR: "min_low_pfn" [crypto/gcm.ko] undefined!
   ERROR: "min_low_pfn" [crypto/asymmetric_keys/asym_tpm.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