[bcain:bcain/qemu_boot 47/62] mm/mm_init.c:920:18: error: no member named 'pageblock_flags' in 'struct zone'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/bcain/linux.git bcain/qemu_boot
head:   a74f943885b7a0e655c7c47d4d02f852c12c1ce1
commit: 944d16e25477c831c7a6708bb81667dcb5acc6a6 [47/62] mm: guard pageblock init against missing pageblock_flags
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20260703/202607031132.GVODI6ZB-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 0a2fb2a2269da0e2a3e230beb6cad39ca314db33)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260703/202607031132.GVODI6ZB-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607031132.GVODI6ZB-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/mm_init.c:920:18: error: no member named 'pageblock_flags' in 'struct zone'
     920 |                         if (likely(z->pageblock_flags)) {
         |                                    ~  ^
   1 error generated.


vim +920 mm/mm_init.c

   887	
   888		for (pfn = start_pfn; pfn < end_pfn; ) {
   889			/*
   890			 * There can be holes in boot-time mem_map[]s handed to this
   891			 * function.  They do not exist on hotplugged memory.
   892			 */
   893			if (context == MEMINIT_EARLY) {
   894				if (overlap_memmap_init(zone, &pfn))
   895					continue;
   896				if (defer_init(nid, pfn, zone_end_pfn)) {
   897					deferred_struct_pages = true;
   898					break;
   899				}
   900			}
   901	
   902			page = pfn_to_page(pfn);
   903			__init_single_page(page, pfn, zone, nid);
   904			if (context == MEMINIT_HOTPLUG) {
   905	#ifdef CONFIG_ZONE_DEVICE
   906				if (zone == ZONE_DEVICE)
   907					__SetPageReserved(page);
   908				else
   909	#endif
   910					__SetPageOffline(page);
   911			}
   912	
   913			/*
   914			 * Usually, we want to mark the pageblock MIGRATE_MOVABLE,
   915			 * such that unmovable allocations won't be scattered all
   916			 * over the place during system boot.
   917			 */
   918			if (pageblock_aligned(pfn)) {
   919				struct zone *z = page_zone(page);
 > 920				if (likely(z->pageblock_flags)) {
   921					init_pageblock_migratetype(page, migratetype,
   922							isolate_pageblock);
   923				} else {
   924					pr_warn_once("memmap_init_range: skipping pageblock init for pfn 0x%lx (zone %s has no pageblock_flags)\n",
   925						     pfn, z->name);
   926				}
   927				cond_resched();
   928			}
   929			pfn++;
   930		}
   931	}
   932	

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