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Source at commit ec7cab4cbb721bff91ec924ec691efd8daf36579 created 12 years 8 months ago. By Maarten ter Huurne, MIPS: JZ4740: A320: Updated quickstart documentation. | |
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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 */ |
90 |
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