4 * management codes for pgdats and zones.
8 #include <linux/stddef.h>
10 #include <linux/mmzone.h>
12 struct pglist_data *first_online_pgdat(void)
14 return NODE_DATA(first_online_node);
17 struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
19 int nid = next_online_node(pgdat->node_id);
21 if (nid == MAX_NUMNODES)
23 return NODE_DATA(nid);
27 * next_zone - helper magic for for_each_zone()
29 struct zone *next_zone(struct zone *zone)
31 pg_data_t *pgdat = zone->zone_pgdat;
33 if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
36 pgdat = next_online_pgdat(pgdat);
38 zone = pgdat->node_zones;
45 static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
48 return node_isset(zonelist_node_idx(zref), *nodes);
51 #endif /* CONFIG_NUMA */
54 /* Returns the next zone at or below highest_zoneidx in a zonelist */
55 struct zoneref *next_zones_zonelist(struct zoneref *z,
56 enum zone_type highest_zoneidx,
61 * Find the next suitable zone to use for the allocation.
62 * Only filter based on nodemask if it's set
64 if (likely(nodes == NULL))
65 while (zonelist_zone_idx(z) > highest_zoneidx)
68 while (zonelist_zone_idx(z) > highest_zoneidx ||
69 (z->zone && !zref_in_nodemask(z, nodes)))
72 *zone = zonelist_zone(z);
76 #ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
77 int memmap_valid_within(unsigned long pfn,
78 struct page *page, struct zone *zone)
80 if (page_to_pfn(page) != pfn)
83 if (page_zone(page) != zone)
88 #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
90 void lruvec_init(struct lruvec *lruvec, struct zone *zone)
94 memset(lruvec, 0, sizeof(struct lruvec));
97 INIT_LIST_HEAD(&lruvec->lists[lru]);
99 #ifdef CONFIG_CGROUP_MEM_RES_CTLR