158  * specifying a zone (MMOP_ONLINE)
160  * "contig-zones": keep zone contiguous
433 static unsigned long find_smallest_section_pfn(int nid, struct zone *zone,  in find_smallest_section_pfn()  argument
444 		if (zone != page_zone(pfn_to_page(start_pfn)))  in find_smallest_section_pfn()
454 static unsigned long find_biggest_section_pfn(int nid, struct zone *zone,  in find_biggest_section_pfn()  argument
469 		if (zone != page_zone(pfn_to_page(pfn)))  in find_biggest_section_pfn()
478 static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,  in shrink_zone_span()  argument
482 	int nid = zone_to_nid(zone);  in shrink_zone_span()
484 	if (zone->zone_start_pfn == start_pfn) {  in shrink_zone_span()
486 		 * If the section is smallest section in the zone, it need  in shrink_zone_span()
487 		 * shrink zone->zone_start_pfn and zone->zone_spanned_pages.  in shrink_zone_span()
489 		 * for shrinking zone.  in shrink_zone_span()
491 		pfn = find_smallest_section_pfn(nid, zone, end_pfn,  in shrink_zone_span()
492 						zone_end_pfn(zone));  in shrink_zone_span()
494 			zone->spanned_pages = zone_end_pfn(zone) - pfn;  in shrink_zone_span()
495 			zone->zone_start_pfn = pfn;  in shrink_zone_span()
497 			zone->zone_start_pfn = 0;  in shrink_zone_span()
498 			zone->spanned_pages = 0;  in shrink_zone_span()
500 	} else if (zone_end_pfn(zone) == end_pfn) {  in shrink_zone_span()
502 		 * If the section is biggest section in the zone, it need  in shrink_zone_span()
503 		 * shrink zone->spanned_pages.  in shrink_zone_span()
505 		 * shrinking zone.  in shrink_zone_span()
507 		pfn = find_biggest_section_pfn(nid, zone, zone->zone_start_pfn,  in shrink_zone_span()
510 			zone->spanned_pages = pfn - zone->zone_start_pfn + 1;  in shrink_zone_span()
512 			zone->zone_start_pfn = 0;  in shrink_zone_span()
513 			zone->spanned_pages = 0;  in shrink_zone_span()
521 	struct zone *zone;  in update_pgdat_span()  local
523 	for (zone = pgdat->node_zones;  in update_pgdat_span()
524 	     zone < pgdat->node_zones + MAX_NR_ZONES; zone++) {  in update_pgdat_span()
525 		unsigned long end_pfn = zone_end_pfn(zone);  in update_pgdat_span()
528 		if (!zone->spanned_pages)  in update_pgdat_span()
531 			node_start_pfn = zone->zone_start_pfn;  in update_pgdat_span()
538 		if (zone->zone_start_pfn < node_start_pfn)  in update_pgdat_span()
539 			node_start_pfn = zone->zone_start_pfn;  in update_pgdat_span()
546 void remove_pfn_range_from_zone(struct zone *zone,  in remove_pfn_range_from_zone()  argument
551 	struct pglist_data *pgdat = zone->zone_pgdat;  in remove_pfn_range_from_zone()
566 	 * Zone shrinking code cannot properly deal with ZONE_DEVICE. So  in remove_pfn_range_from_zone()
570 	if (zone_is_zone_device(zone))  in remove_pfn_range_from_zone()
573 	clear_zone_contiguous(zone);  in remove_pfn_range_from_zone()
575 	shrink_zone_span(zone, start_pfn, start_pfn + nr_pages);  in remove_pfn_range_from_zone()
578 	set_zone_contiguous(zone);  in remove_pfn_range_from_zone()
666 	 * zone ("present").  in online_pages_range()
704 	struct zone *zone, struct memory_notify *arg)  in node_states_check_changes_online()  argument
706 	int nid = zone_to_nid(zone);  in node_states_check_changes_online()
713 	if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY))  in node_states_check_changes_online()
726 static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn,  in resize_zone_range()  argument
729 	unsigned long old_end_pfn = zone_end_pfn(zone);  in resize_zone_range()
731 	if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn)  in resize_zone_range()
732 		zone->zone_start_pfn = start_pfn;  in resize_zone_range()
734 	zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn;  in resize_zone_range()
763  * Associate the pfn range with the given zone, initializing the memmaps
764  * and resizing the pgdat/zone data to span the added pages. After this
769  * zone stats (e.g., nr_isolate_pageblock) are touched.
771 void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,  in move_pfn_range_to_zone()  argument
775 	struct pglist_data *pgdat = zone->zone_pgdat;  in move_pfn_range_to_zone()
778 	clear_zone_contiguous(zone);  in move_pfn_range_to_zone()
780 	if (zone_is_empty(zone))  in move_pfn_range_to_zone()
781 		init_currently_empty_zone(zone, start_pfn, nr_pages);  in move_pfn_range_to_zone()
782 	resize_zone_range(zone, start_pfn, nr_pages);  in move_pfn_range_to_zone()
791 	if (zone_is_zone_device(zone)) {  in move_pfn_range_to_zone()
800 	 * with their zone properly. Not nice but set_pfnblock_flags_mask  in move_pfn_range_to_zone()
801 	 * expects the zone spans the pfn range. All the pages in the range  in move_pfn_range_to_zone()
804 	memmap_init_range(nr_pages, nid, zone_idx(zone), start_pfn, 0,  in move_pfn_range_to_zone()
807 	set_zone_contiguous(zone);  in move_pfn_range_to_zone()
816 					    struct zone *zone)  in auto_movable_stats_account_zone()  argument
818 	if (zone_idx(zone) == ZONE_MOVABLE) {  in auto_movable_stats_account_zone()
819 		stats->movable_pages += zone->present_pages;  in auto_movable_stats_account_zone()
821 		stats->kernel_early_pages += zone->present_early_pages;  in auto_movable_stats_account_zone()
827 		stats->movable_pages += zone->cma_pages;  in auto_movable_stats_account_zone()
828 		stats->kernel_early_pages -= zone->cma_pages;  in auto_movable_stats_account_zone()
853 	 * satisfy the configured zone ratio.  in auto_movable_stats_account_group()
870 	struct zone *zone;  in auto_movable_can_online_movable()  local
876 		for_each_populated_zone(zone)  in auto_movable_can_online_movable()
877 			auto_movable_stats_account_zone(&stats, zone);  in auto_movable_can_online_movable()
882 			zone = pgdat->node_zones + i;  in auto_movable_can_online_movable()
883 			if (populated_zone(zone))  in auto_movable_can_online_movable()
884 				auto_movable_stats_account_zone(&stats, zone);  in auto_movable_can_online_movable()
915  * Returns a default kernel memory zone for the given pfn range.
916  * If no kernel zone covers this pfn range it will automatically go
919 static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn,  in default_kernel_zone_for_pfn()
926 		struct zone *zone = &pgdat->node_zones[zid];  in default_kernel_zone_for_pfn()  local
928 		if (zone_intersects(zone, start_pfn, nr_pages))  in default_kernel_zone_for_pfn()
929 			return zone;  in default_kernel_zone_for_pfn()
936  * Determine to which zone to online memory dynamically based on user
945  * We don't allow for hotplugged memory in a KERNEL zone to increase the
956  *    hotunplugging, as implemented in hypervisors, could result in zone
985 static struct zone *auto_movable_zone_for_pfn(int nid,  in auto_movable_zone_for_pfn()
1010 		 * to the same zone, because dynamic memory groups only deal  in auto_movable_zone_for_pfn()
1046 static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn,  in default_zone_for_pfn()
1049 	struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn,  in default_zone_for_pfn()
1051 	struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE];  in default_zone_for_pfn()
1056 	 * We inherit the existing zone in a simple case where zones do not  in default_zone_for_pfn()
1063 	 * If the range doesn't belong to any zone or two zones overlap in the  in default_zone_for_pfn()
1064 	 * given range then we use movable zone only if movable_node is  in default_zone_for_pfn()
1065 	 * enabled because we always online to a kernel zone by default.  in default_zone_for_pfn()
1070 struct zone *zone_for_pfn_range(int online_type, int nid,  in zone_for_pfn_range()
1093 	struct zone *zone = page_zone(page);  in adjust_present_page_count()  local
1094 	const bool movable = zone_idx(zone) == ZONE_MOVABLE;  in adjust_present_page_count()
1101 		zone->present_early_pages += nr_pages;  in adjust_present_page_count()
1102 	zone->present_pages += nr_pages;  in adjust_present_page_count()
1103 	zone->zone_pgdat->node_present_pages += nr_pages;  in adjust_present_page_count()
1112 			      struct zone *zone, bool mhp_off_inaccessible)  in mhp_init_memmap_on_memory()  argument
1130 	move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_UNMOVABLE);  in mhp_init_memmap_on_memory()
1174 		       struct zone *zone, struct memory_group *group)  in online_pages()  argument
1178 	const int nid = zone_to_nid(zone);  in online_pages()
1194 	/* associate pfn range with the zone */  in online_pages()
1195 	move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE);  in online_pages()
1199 	node_states_check_changes_online(nr_pages, zone, &arg);  in online_pages()
1210 	spin_lock_irqsave(&zone->lock, flags);  in online_pages()
1211 	zone->nr_isolate_pageblock += nr_pages / pageblock_nr_pages;  in online_pages()
1212 	spin_unlock_irqrestore(&zone->lock, flags);  in online_pages()
1215 	 * If this zone is not populated, then it is not in zonelist.  in online_pages()
1216 	 * This means the page allocator ignores this zone.  in online_pages()
1219 	if (!populated_zone(zone)) {  in online_pages()
1221 		setup_zone_pageset(zone);  in online_pages()
1237 	 * zone to make sure the just onlined pages are properly distributed  in online_pages()
1240 	shuffle_zone(zone);  in online_pages()
1258 	remove_pfn_range_from_zone(zone, pfn, nr_pages);  in online_pages()
1279 	 * The node we allocated has no zone fallback lists. For avoiding  in hotadd_init_pgdat()
1853 		 * We have checked that migration range is on a single zone so  in do_migrate_range()
1891 		struct zone *zone, struct memory_notify *arg)  in node_states_check_changes_offline()  argument
1893 	struct pglist_data *pgdat = zone->zone_pgdat;  in node_states_check_changes_offline()
1910 	if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages)  in node_states_check_changes_offline()
1911 		arg->status_change_nid_normal = zone_to_nid(zone);  in node_states_check_changes_offline()
1925 		arg->status_change_nid = zone_to_nid(zone);  in node_states_check_changes_offline()
1950 			struct zone *zone, struct memory_group *group)  in offline_pages()  argument
1954 	const int node = zone_to_nid(zone);  in offline_pages()
1988 	 * We only support offlining of memory blocks managed by a single zone,  in offline_pages()
1992 	if (WARN_ON_ONCE(page_zone(pfn_to_page(start_pfn)) != zone ||  in offline_pages()
1993 			 page_zone(pfn_to_page(end_pfn - 1)) != zone)) {  in offline_pages()
2003 	zone_pcp_disable(zone);  in offline_pages()
2017 	node_states_check_changes_offline(nr_pages, zone, &arg);  in offline_pages()
2081 	spin_lock_irqsave(&zone->lock, flags);  in offline_pages()
2082 	zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages;  in offline_pages()
2083 	spin_unlock_irqrestore(&zone->lock, flags);  in offline_pages()
2086 	zone_pcp_enable(zone);  in offline_pages()
2096 	 * Make sure to mark the node as memory-less before rebuilding the zone  in offline_pages()
2100 	if (!populated_zone(zone)) {  in offline_pages()
2101 		zone_pcp_reset(zone);  in offline_pages()
2113 	remove_pfn_range_from_zone(zone, start_pfn, nr_pages);  in offline_pages()
2122 	zone_pcp_enable(zone);  in offline_pages()
2346 	 * Sense the online_type via the zone of the memory block. Offlining  in try_offline_memory_block()