1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2
3 #ifndef _LINUX_MMZONE_H
4 #define _LINUX_MMZONE_H
5
6 #include <linux/atomic.h>
7
8 struct pglist_data *first_online_pgdat(void);
9 struct pglist_data *next_online_pgdat(struct pglist_data *pgdat);
10
11 #define for_each_online_pgdat(pgdat) \
12 for (pgdat = first_online_pgdat(); \
13 pgdat; \
14 pgdat = next_online_pgdat(pgdat))
15
16 enum zone_type {
17 __MAX_NR_ZONES
18 };
19
20 #define MAX_NR_ZONES __MAX_NR_ZONES
21 #define MAX_PAGE_ORDER 10
22 #define MAX_ORDER_NR_PAGES (1 << MAX_PAGE_ORDER)
23
24 #define pageblock_order MAX_PAGE_ORDER
25 #define pageblock_nr_pages BIT(pageblock_order)
26 #define pageblock_align(pfn) ALIGN((pfn), pageblock_nr_pages)
27 #define pageblock_start_pfn(pfn) ALIGN_DOWN((pfn), pageblock_nr_pages)
28
29 struct zone {
30 atomic_long_t managed_pages;
31 };
32
33 typedef struct pglist_data {
34 struct zone node_zones[MAX_NR_ZONES];
35
36 } pg_data_t;
37
38 #endif /* _LINUX_MMZONE_H */
39
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