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/*

 * linux/mm/mmzone.c

 *

 * management codes for pgdats and zones.

 */

#include <linux/stddef.h>

#include <linux/mmzone.h>

#include <linux/module.h>

struct pglist_data *first_online_pgdat(void)

{

        return NODE_DATA(first_online_node);

}

struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)

{

        int nid = next_online_node(pgdat->node_id);

        if (nid == MAX_NUMNODES)

                return NULL;

        return NODE_DATA(nid);

}

/*

 * next_zone - helper magic for for_each_zone()

 */

struct zone *next_zone(struct zone *zone)

{

        pg_data_t *pgdat = zone->zone_pgdat;

        if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)

                zone++;

        else {

                pgdat = next_online_pgdat(pgdat);

                if (pgdat)

                        zone = pgdat->node_zones;

                else

                        zone = NULL;

        }

        return zone;

}