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SubjectERROR: modpost: "min_low_pfn" undefined!
Hi Christoph,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: f873db9acd3c92d4741bc3676c9eb511b2f9a6f6
commit: cc97923a5bccc776851c242b61015faf288d5c22 block: move dma drain handling to scsi
date: 4 months ago
config: microblaze-randconfig-r021-20200822 (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 cc97923a5bccc776851c242b61015faf288d5c22
# 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" [net/mac80211/mac80211.ko] undefined!
ERROR: modpost: "min_low_pfn" [drivers/mtd/spi-nor/spi-nor.ko] undefined!
ERROR: modpost: "min_low_pfn" [drivers/mtd/nand/raw/nand.ko] undefined!
ERROR: modpost: "min_low_pfn" [drivers/mmc/core/mmc_core.ko] undefined!
ERROR: modpost: "min_low_pfn" [drivers/md/dm-crypt.ko] undefined!
>> ERROR: modpost: "min_low_pfn" [drivers/scsi/scsi_mod.ko] undefined!
ERROR: modpost: "min_low_pfn" [crypto/tcrypt.ko] undefined!
ERROR: modpost: "min_low_pfn" [crypto/ccm.ko] undefined!
ERROR: modpost: "min_low_pfn" [security/keys/encrypted-keys/encrypted-keys.ko] undefined!

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