tree: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git meminit/descending-nodes/v1 head: 4360e9f3bf49a500417f73e62a133567fdf9842e commit: b3e781793b0c9f7c2ae41a9fe3d6dac8a7e53e06 [2/3] dev: fix memmap init for descending nodes config: arm-randconfig-r034-20210622 (attached as .config) compiler: arm-linux-gnueabi-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 # https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/commit/?id... git remote add rppt https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git git fetch --no-tags rppt meminit/descending-nodes/v1 git checkout b3e781793b0c9f7c2ae41a9fe3d6dac8a7e53e06 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): mm/page_alloc.c:2670:5: warning: no previous prototype for 'find_suitable_fallback' [-Wmissing-prototypes] 2670 | int find_suitable_fallback(struct free_area *area, unsigned int order, | ^~~~~~~~~~~~~~~~~~~~~~ mm/page_alloc.c:3651:15: warning: no previous prototype for 'should_fail_alloc_page' [-Wmissing-prototypes] 3651 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | ^~~~~~~~~~~~~~~~~~~~~~ mm/page_alloc.c: In function 'init_unavailable_range': mm/page_alloc.c:6511:9: error: 'return' with a value, in function returning void [-Werror=return-type] 6511 | return 0; | ^ mm/page_alloc.c:6507:20: note: declared here 6507 | static inline void init_unavailable_range(unsigned long spfn, | ^~~~~~~~~~~~~~~~~~~~~~ mm/page_alloc.c: In function 'memmap_init': 6545 | int i, j, zone_id, nid; | ^~~~~~~ cc1: some warnings being treated as errors vim +/zone_id +6545 mm/page_alloc.c 6540 6541 static void __init memmap_init(void) 6542 { 6543 unsigned long start_pfn, end_pfn; 6544 unsigned long hole_pfn = 0; 6546 6547 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { 6548 struct pglist_data *node = NODE_DATA(nid); 6549 6550 for (j = 0; j < MAX_NR_ZONES; j++) { 6551 struct zone *zone = node->node_zones + j; 6552 6553 if (!populated_zone(zone)) 6554 continue; 6555 6556 memmap_init_zone_range(zone, start_pfn, end_pfn, 6557 &hole_pfn); 6558 zone_id = j; 6559 } 6560 } 6561 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org