1 // SPDX-License-Identifier: GPL-2.0
5 * management codes for pgdats, zones and page flags
9 #include <linux/stddef.h>
11 #include <linux/mmzone.h>
13 struct pglist_data *first_online_pgdat(void)
15 return NODE_DATA(first_online_node);
18 struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
20 int nid = next_online_node(pgdat->node_id);
22 if (nid == MAX_NUMNODES)
24 return NODE_DATA(nid);
28 * next_zone - helper magic for for_each_zone()
30 struct zone *next_zone(struct zone *zone)
32 pg_data_t *pgdat = zone->zone_pgdat;
34 if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
37 pgdat = next_online_pgdat(pgdat);
39 zone = pgdat->node_zones;
46 static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
49 return node_isset(zonelist_node_idx(zref), *nodes);
52 #endif /* CONFIG_NUMA */
55 /* Returns the next zone at or below highest_zoneidx in a zonelist */
56 struct zoneref *__next_zones_zonelist(struct zoneref *z,
57 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 (unlikely(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)))
75 #ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
76 bool memmap_valid_within(unsigned long pfn,
77 struct page *page, struct zone *zone)
79 if (page_to_pfn(page) != pfn)
82 if (page_zone(page) != zone)
87 #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
89 void lruvec_init(struct lruvec *lruvec)
93 memset(lruvec, 0, sizeof(struct lruvec));
96 INIT_LIST_HEAD(&lruvec->lists[lru]);
99 #if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS)
100 int page_cpupid_xchg_last(struct page *page, int cpupid)
102 unsigned long old_flags, flags;
106 old_flags = flags = page->flags;
107 last_cpupid = page_cpupid_last(page);
109 flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
110 flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
111 } while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags));