306  * call this function after deciding the zone to which to
354 static unsigned long find_smallest_section_pfn(int nid, struct zone *zone,  in find_smallest_section_pfn()  argument
365 		if (zone != page_zone(pfn_to_page(start_pfn)))  in find_smallest_section_pfn()
375 static unsigned long find_biggest_section_pfn(int nid, struct zone *zone,  in find_biggest_section_pfn()  argument
390 		if (zone != page_zone(pfn_to_page(pfn)))  in find_biggest_section_pfn()
399 static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,  in shrink_zone_span()  argument
403 	int nid = zone_to_nid(zone);  in shrink_zone_span()
405 	zone_span_writelock(zone);  in shrink_zone_span()
406 	if (zone->zone_start_pfn == start_pfn) {  in shrink_zone_span()
408 		 * If the section is smallest section in the zone, it need  in shrink_zone_span()
409 		 * shrink zone->zone_start_pfn and zone->zone_spanned_pages.  in shrink_zone_span()
411 		 * for shrinking zone.  in shrink_zone_span()
413 		pfn = find_smallest_section_pfn(nid, zone, end_pfn,  in shrink_zone_span()
414 						zone_end_pfn(zone));  in shrink_zone_span()
416 			zone->spanned_pages = zone_end_pfn(zone) - pfn;  in shrink_zone_span()
417 			zone->zone_start_pfn = pfn;  in shrink_zone_span()
419 			zone->zone_start_pfn = 0;  in shrink_zone_span()
420 			zone->spanned_pages = 0;  in shrink_zone_span()
422 	} else if (zone_end_pfn(zone) == end_pfn) {  in shrink_zone_span()
424 		 * If the section is biggest section in the zone, it need  in shrink_zone_span()
425 		 * shrink zone->spanned_pages.  in shrink_zone_span()
427 		 * shrinking zone.  in shrink_zone_span()
429 		pfn = find_biggest_section_pfn(nid, zone, zone->zone_start_pfn,  in shrink_zone_span()
432 			zone->spanned_pages = pfn - zone->zone_start_pfn + 1;  in shrink_zone_span()
434 			zone->zone_start_pfn = 0;  in shrink_zone_span()
435 			zone->spanned_pages = 0;  in shrink_zone_span()
438 	zone_span_writeunlock(zone);  in shrink_zone_span()
444 	struct zone *zone;  in update_pgdat_span()  local
446 	for (zone = pgdat->node_zones;  in update_pgdat_span()
447 	     zone < pgdat->node_zones + MAX_NR_ZONES; zone++) {  in update_pgdat_span()
448 		unsigned long zone_end_pfn = zone->zone_start_pfn +  in update_pgdat_span()
449 					     zone->spanned_pages;  in update_pgdat_span()
452 		if (!zone->spanned_pages)  in update_pgdat_span()
455 			node_start_pfn = zone->zone_start_pfn;  in update_pgdat_span()
462 		if (zone->zone_start_pfn < node_start_pfn)  in update_pgdat_span()
463 			node_start_pfn = zone->zone_start_pfn;  in update_pgdat_span()
470 void __ref remove_pfn_range_from_zone(struct zone *zone,  in remove_pfn_range_from_zone()  argument
475 	struct pglist_data *pgdat = zone->zone_pgdat;  in remove_pfn_range_from_zone()
491 	 * Zone shrinking code cannot properly deal with ZONE_DEVICE. So  in remove_pfn_range_from_zone()
495 	if (zone_idx(zone) == ZONE_DEVICE)  in remove_pfn_range_from_zone()
499 	clear_zone_contiguous(zone);  in remove_pfn_range_from_zone()
501 	pgdat_resize_lock(zone->zone_pgdat, &flags);  in remove_pfn_range_from_zone()
502 	shrink_zone_span(zone, start_pfn, start_pfn + nr_pages);  in remove_pfn_range_from_zone()
504 	pgdat_resize_unlock(zone->zone_pgdat, &flags);  in remove_pfn_range_from_zone()
506 	set_zone_contiguous(zone);  in remove_pfn_range_from_zone()
619 	 * zone ("present").  in online_pages_range()
630 	struct zone *zone, struct memory_notify *arg)  in node_states_check_changes_online()  argument
632 	int nid = zone_to_nid(zone);  in node_states_check_changes_online()
640 	if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY))  in node_states_check_changes_online()
643 	if (zone_idx(zone) <= ZONE_HIGHMEM && !node_state(nid, N_HIGH_MEMORY))  in node_states_check_changes_online()
660 static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn,  in resize_zone_range()  argument
663 	unsigned long old_end_pfn = zone_end_pfn(zone);  in resize_zone_range()
665 	if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn)  in resize_zone_range()
666 		zone->zone_start_pfn = start_pfn;  in resize_zone_range()
668 	zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn;  in resize_zone_range()
683  * Associate the pfn range with the given zone, initializing the memmaps
684  * and resizing the pgdat/zone data to span the added pages. After this
689  * zone stats (e.g., nr_isolate_pageblock) are touched.
691 void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,  in move_pfn_range_to_zone()  argument
695 	struct pglist_data *pgdat = zone->zone_pgdat;  in move_pfn_range_to_zone()
699 	clear_zone_contiguous(zone);  in move_pfn_range_to_zone()
701 	/* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */  in move_pfn_range_to_zone()
703 	zone_span_writelock(zone);  in move_pfn_range_to_zone()
704 	if (zone_is_empty(zone))  in move_pfn_range_to_zone()
705 		init_currently_empty_zone(zone, start_pfn, nr_pages);  in move_pfn_range_to_zone()
706 	resize_zone_range(zone, start_pfn, nr_pages);  in move_pfn_range_to_zone()
707 	zone_span_writeunlock(zone);  in move_pfn_range_to_zone()
713 	 * with their zone properly. Not nice but set_pfnblock_flags_mask  in move_pfn_range_to_zone()
714 	 * expects the zone spans the pfn range. All the pages in the range  in move_pfn_range_to_zone()
717 	memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn,  in move_pfn_range_to_zone()
720 	set_zone_contiguous(zone);  in move_pfn_range_to_zone()
724  * Returns a default kernel memory zone for the given pfn range.
725  * If no kernel zone covers this pfn range it will automatically go
728 static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn,  in default_kernel_zone_for_pfn()
735 		struct zone *zone = &pgdat->node_zones[zid];  in default_kernel_zone_for_pfn()  local
737 		if (zone_intersects(zone, start_pfn, nr_pages))  in default_kernel_zone_for_pfn()
738 			return zone;  in default_kernel_zone_for_pfn()
744 static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn,  in default_zone_for_pfn()
747 	struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn,  in default_zone_for_pfn()
749 	struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE];  in default_zone_for_pfn()
754 	 * We inherit the existing zone in a simple case where zones do not  in default_zone_for_pfn()
761 	 * If the range doesn't belong to any zone or two zones overlap in the  in default_zone_for_pfn()
762 	 * given range then we use movable zone only if movable_node is  in default_zone_for_pfn()
763 	 * enabled because we always online to a kernel zone by default.  in default_zone_for_pfn()
768 struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,  in zone_for_pfn_range()
784 	struct zone *zone;  in online_pages()  local
796 	/* associate pfn range with the zone */  in online_pages()
797 	zone = zone_for_pfn_range(online_type, nid, pfn, nr_pages);  in online_pages()
798 	move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE);  in online_pages()
802 	node_states_check_changes_online(nr_pages, zone, &arg);  in online_pages()
813 	spin_lock_irqsave(&zone->lock, flags);  in online_pages()
814 	zone->nr_isolate_pageblock += nr_pages / pageblock_nr_pages;  in online_pages()
815 	spin_unlock_irqrestore(&zone->lock, flags);  in online_pages()
818 	 * If this zone is not populated, then it is not in zonelist.  in online_pages()
819 	 * This means the page allocator ignores this zone.  in online_pages()
822 	if (!populated_zone(zone)) {  in online_pages()
824 		setup_zone_pageset(zone);  in online_pages()
828 	zone->present_pages += nr_pages;  in online_pages()
830 	pgdat_resize_lock(zone->zone_pgdat, &flags);  in online_pages()
831 	zone->zone_pgdat->node_present_pages += nr_pages;  in online_pages()
832 	pgdat_resize_unlock(zone->zone_pgdat, &flags);  in online_pages()
837 	zone_pcp_update(zone);  in online_pages()
845 	 * zone to make sure the just onlined pages are properly distributed  in online_pages()
848 	shuffle_zone(zone);  in online_pages()
866 	remove_pfn_range_from_zone(zone, pfn, nr_pages);  in online_pages()
874 	struct zone *z;  in reset_node_present_pages()
922 	 * The node we allocated has no zone fallback lists. For avoiding  in hotadd_new_pgdat()
1186  * Confirm all pages in a range [start, end) belong to the same zone (skipping
1187  * memory holes). When true, return the zone.
1189 struct zone *test_pages_in_a_zone(unsigned long start_pfn,  in test_pages_in_a_zone()
1193 	struct zone *zone = NULL;  in test_pages_in_a_zone()  local
1211 			/* Check if we got outside of the zone */  in test_pages_in_a_zone()
1212 			if (zone && !zone_spans_pfn(zone, pfn + i))  in test_pages_in_a_zone()
1215 			if (zone && page_zone(page) != zone)  in test_pages_in_a_zone()
1217 			zone = page_zone(page);  in test_pages_in_a_zone()
1221 	return zone;  in test_pages_in_a_zone()
1341 		 * We have checked that migration range is on a single zone so  in do_migrate_range()
1378 		struct zone *zone, struct memory_notify *arg)  in node_states_check_changes_offline()  argument
1380 	struct pglist_data *pgdat = zone->zone_pgdat;  in node_states_check_changes_offline()
1398 	if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages)  in node_states_check_changes_offline()
1399 		arg->status_change_nid_normal = zone_to_nid(zone);  in node_states_check_changes_offline()
1406 	 * If the zone is within the range of [0..ZONE_HIGHMEM), and  in node_states_check_changes_offline()
1411 	if (zone_idx(zone) <= ZONE_HIGHMEM && nr_pages >= present_pages)  in node_states_check_changes_offline()
1412 		arg->status_change_nid_high = zone_to_nid(zone);  in node_states_check_changes_offline()
1428 		arg->status_change_nid = zone_to_nid(zone);  in node_states_check_changes_offline()
1457 	struct zone *zone;  in offline_pages()  local
1487 	zone = test_pages_in_a_zone(start_pfn, end_pfn);  in offline_pages()
1488 	if (!zone) {  in offline_pages()
1493 	node = zone_to_nid(zone);  in offline_pages()
1506 	node_states_check_changes_offline(nr_pages, zone, &arg);  in offline_pages()
1567 			drain_all_pages(zone);  in offline_pages()
1579 	spin_lock_irqsave(&zone->lock, flags);  in offline_pages()
1580 	zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages;  in offline_pages()
1581 	spin_unlock_irqrestore(&zone->lock, flags);  in offline_pages()
1585 	zone->present_pages -= nr_pages;  in offline_pages()
1587 	pgdat_resize_lock(zone->zone_pgdat, &flags);  in offline_pages()
1588 	zone->zone_pgdat->node_present_pages -= nr_pages;  in offline_pages()
1589 	pgdat_resize_unlock(zone->zone_pgdat, &flags);  in offline_pages()
1593 	if (!populated_zone(zone)) {  in offline_pages()
1594 		zone_pcp_reset(zone);  in offline_pages()
1597 		zone_pcp_update(zone);  in offline_pages()
1608 	remove_pfn_range_from_zone(zone, start_pfn, nr_pages);  in offline_pages()