Hi Arnd, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f873db9acd3c92d4741bc3676c9eb511b2f9a6f6 commit: 710ec38b0f633ab3e2581f07a73442d809e28ab0 mm: add dummy can_do_mlock() helper date: 11 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 710ec38b0f633ab3e2581f07a73442d809e28ab0 # 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@xxxxxxxxx> All errors (new ones prefixed by >>): ERROR: "min_low_pfn" [net/mac80211/mac80211.ko] undefined! ERROR: "min_low_pfn" [drivers/mtd/spi-nor/spi-nor.ko] undefined! ERROR: "min_low_pfn" [drivers/mtd/nand/raw/nand.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" [crypto/tcrypt.ko] undefined! ERROR: "min_low_pfn" [crypto/ccm.ko] undefined! >> ERROR: "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@xxxxxxxxxxxx
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