50 lines
847 B
C
50 lines
847 B
C
|
/*
|
||
|
|
* 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);
|
||
|
|
}
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(first_online_pgdat);
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(next_online_pgdat);
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(next_zone);
|
||
|
|
|