tree: yhuang/random-r0.1i head: b7aa3b8f1aab2a4cae7429eca7ad6246975f4996 commit: 321be1f29c4be3e5407b5463bcb053990c65cfda [30/45] mm: Identify cold pages via randomly sampling + idle page tracking config: sparc64-defconfig (attached as .config) compiler: sparc64-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 321be1f29c4be3e5407b5463bcb053990c65cfda # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=sparc64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; Note: the yhuang/random-r0.1i HEAD b7aa3b8f1aab2a4cae7429eca7ad6246975f4996 builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): mm/page_alloc.o: In function `free_area_init_node': page_alloc.c:(.init.text+0xa6c): undefined reference to `node_random_promote_select_work' page_alloc.c:(.init.text+0xa70): undefined reference to `node_random_promote_select_work' page_alloc.c:(.init.text+0xac8): undefined reference to `node_random_promote_check_work' page_alloc.c:(.init.text+0xacc): undefined reference to `node_random_promote_check_work' page_alloc.c:(.init.text+0xb28): undefined reference to `node_random_demote_select_work' page_alloc.c:(.init.text+0xb84): undefined reference to `node_random_demote_check_work' mm/migrate.o: In function `move_to_new_page': migrate.c:(.text+0x1454): undefined reference to `inc_hmem_state' drivers/base/node.o: In function `random_migrate_period_ms_store': node.c:(.text+0x144): undefined reference to `node_random_migrate_stop' node.c:(.text+0x154): undefined reference to `node_random_migrate_start' drivers/base/node.o: In function `random_migrate_mb_store': node.c:(.text+0x2bc): undefined reference to `node_random_migrate_pages' node.c:(.text+0x328): undefined reference to `node_random_migrate_stop' node.c:(.text+0x340): undefined reference to `node_random_migrate_start' --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation