1 /*
2 * linux/mm/mmzone.c
3 *
4 * management codes for pgdats and zones.
5 */
6
7
8 #include <linux/config.h>
9 #include <linux/stddef.h>
10 #include <linux/mmzone.h>
11 #include <linux/module.h>
12
13 struct pglist_data *first_online_pgdat(void)
14 {
15 return NODE_DATA(first_online_node);
16 }
17
18 EXPORT_SYMBOL(first_online_pgdat);
19
20 struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
21 {
22 int nid = next_online_node(pgdat->node_id);
23
24 if (nid == MAX_NUMNODES)
25 return NULL;
26 return NODE_DATA(nid);
27 }
28 EXPORT_SYMBOL(next_online_pgdat);
29
30
31 /*
32 * next_zone - helper magic for for_each_zone()
33 */
34 struct zone *next_zone(struct zone *zone)
35 {
36 pg_data_t *pgdat = zone->zone_pgdat;
37
38 if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
39 zone++;
40 else {
41 pgdat = next_online_pgdat(pgdat);
42 if (pgdat)
43 zone = pgdat->node_zones;
44 else
45 zone = NULL;
46 }
47 return zone;
48 }
49 EXPORT_SYMBOL(next_zone);
50
51
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