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KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -08001/*
2 * linux/mm/mmzone.c
3 *
4 * management codes for pgdats and zones.
5 */
6
7
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -08008#include <linux/stddef.h>
9#include <linux/mmzone.h>
10#include <linux/module.h>
11
12struct pglist_data *first_online_pgdat(void)
13{
14 return NODE_DATA(first_online_node);
15}
16
Adrian Bunkb0d85c52006-07-10 04:44:23 -070017EXPORT_UNUSED_SYMBOL(first_online_pgdat); /* June 2006 */
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -080018
19struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
20{
21 int nid = next_online_node(pgdat->node_id);
22
23 if (nid == MAX_NUMNODES)
24 return NULL;
25 return NODE_DATA(nid);
26}
Adrian Bunkb0d85c52006-07-10 04:44:23 -070027EXPORT_UNUSED_SYMBOL(next_online_pgdat); /* June 2006 */
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -080028
29
30/*
31 * next_zone - helper magic for for_each_zone()
32 */
33struct zone *next_zone(struct zone *zone)
34{
35 pg_data_t *pgdat = zone->zone_pgdat;
36
37 if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
38 zone++;
39 else {
40 pgdat = next_online_pgdat(pgdat);
41 if (pgdat)
42 zone = pgdat->node_zones;
43 else
44 zone = NULL;
45 }
46 return zone;
47}
Adrian Bunkb0d85c52006-07-10 04:44:23 -070048EXPORT_UNUSED_SYMBOL(next_zone); /* June 2006 */
KAMEZAWA Hiroyuki95144c72006-03-27 01:16:02 -080049