mmzone.c 750 B

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