Hi Zi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on hnaz-mm/master] [also build test WARNING on powerpc/next linux/master linus/master v5.17-rc3 next-20220211] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Zi-Yan/Use-pageblock_order-for-c... base: https://github.com/hnaz/linux-mm master config: x86_64-randconfig-a011 (https://download.01.org/0day-ci/archive/20220212/202202120616.vgw2VpUz-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/5aacb9dfc8abb1a0610b70226606408a9... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Zi-Yan/Use-pageblock_order-for-cma-and-alloc_contig_range-alignment/20220212-004358 git checkout 5aacb9dfc8abb1a0610b70226606408a96d0e997 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash 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:3869:15: warning: no previous prototype for 'should_fail_alloc_page' [-Wmissing-prototypes] 3869 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | ^~~~~~~~~~~~~~~~~~~~~~ 8988 | int __alloc_contig_migrate_range(struct compact_control *cc, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/__alloc_contig_migrate_range +8988 mm/page_alloc.c 8986 8987 /* [start, end) must belong to a single zone. */ 8989 unsigned long start, unsigned long end) 8990 { 8991 /* This function is based on compact_zone() from compaction.c. */ 8992 unsigned int nr_reclaimed; 8993 unsigned long pfn = start; 8994 unsigned int tries = 0; 8995 int ret = 0; 8996 struct migration_target_control mtc = { 8997 .nid = zone_to_nid(cc->zone), 8998 .gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL, 8999 }; 9000 9001 lru_cache_disable(); 9002 9003 while (pfn < end || !list_empty(&cc->migratepages)) { 9004 if (fatal_signal_pending(current)) { 9005 ret = -EINTR; 9006 break; 9007 } 9008 9009 if (list_empty(&cc->migratepages)) { 9010 cc->nr_migratepages = 0; 9011 ret = isolate_migratepages_range(cc, pfn, end); 9012 if (ret && ret != -EAGAIN) 9013 break; 9014 pfn = cc->migrate_pfn; 9015 tries = 0; 9016 } else if (++tries == 5) { 9017 ret = -EBUSY; 9018 break; 9019 } 9020 9021 nr_reclaimed = reclaim_clean_pages_from_list(cc->zone, 9022 &cc->migratepages); 9023 cc->nr_migratepages -= nr_reclaimed; 9024 9025 ret = migrate_pages(&cc->migratepages, alloc_migration_target, 9026 NULL, (unsigned long)&mtc, cc->mode, MR_CONTIG_RANGE, NULL); 9027 9028 /* 9029 * On -ENOMEM, migrate_pages() bails out right away. It is pointless 9030 * to retry again over this error, so do the same here. 9031 */ 9032 if (ret == -ENOMEM) 9033 break; 9034 } 9035 9036 lru_cache_enable(); 9037 if (ret < 0) { 9038 if (ret == -EBUSY) 9039 alloc_contig_dump_pages(&cc->migratepages); 9040 putback_movable_pages(&cc->migratepages); 9041 return ret; 9042 } 9043 return 0; 9044 } 9045 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org