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2012-10-19 Initial commit; Original 'BQ Edison' code
1 /*
2 * linux/mm/mmzone.c
3 *
4 * management codes for pgdats and zones.
5 */
6
7
8 #include <linux/stddef.h>
9 #include <linux/mm.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 struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
19 {
20 int nid = next_online_node(pgdat->node_id);
21
22 if (nid == MAX_NUMNODES)
23 return NULL;
24 return NODE_DATA(nid);
25 }
26
27 /*
28 * next_zone - helper magic for for_each_zone()
29 */
30 struct zone *next_zone(struct zone *zone)
31 {
32 pg_data_t *pgdat = zone->zone_pgdat;
33
34 if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
35 zone++;
36 else {
37 pgdat = next_online_pgdat(pgdat);
38 if (pgdat)
39 zone = pgdat->node_zones;
40 else
41 zone = NULL;
42 }
43 return zone;
44 }
45
46 static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
47 {
48 #ifdef CONFIG_NUMA
49 return node_isset(zonelist_node_idx(zref), *nodes);
50 #else
51 return 1;
52 #endif /* CONFIG_NUMA */
53 }
54
55 /* Returns the next zone at or below highest_zoneidx in a zonelist */
56 struct zoneref *next_zones_zonelist(struct zoneref *z,
57 enum zone_type highest_zoneidx,
58 nodemask_t *nodes,
59 struct zone **zone)
60 {
61 /*
62 * Find the next suitable zone to use for the allocation.
63 * Only filter based on nodemask if it's set
64 */
65 if (likely(nodes == NULL))
66 while (zonelist_zone_idx(z) > highest_zoneidx)
67 z++;
68 else
69 while (zonelist_zone_idx(z) > highest_zoneidx ||
70 (z->zone && !zref_in_nodemask(z, nodes)))
71 z++;
72
73 *zone = zonelist_zone(z);
74 return z;
75 }
76
77 #ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
78 int memmap_valid_within(unsigned long pfn,
79 struct page *page, struct zone *zone)
80 {
81 if (page_to_pfn(page) != pfn)
82 return 0;
83
84 if (page_zone(page) != zone)
85 return 0;
86
87 return 1;
88 }
89 #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
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