/* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef _LINUX_MMZONE_H
#define _LINUX_MMZONE_H

#include <linux/atomic.h>

struct pglist_data *first_online_pgdat(void);
struct pglist_data *next_online_pgdat(struct pglist_data *pgdat);

#define for_each_online_pgdat(pgdat)                    \
        for (pgdat = first_online_pgdat();              \
             pgdat;                                     \
             pgdat = next_online_pgdat(pgdat))

enum zone_type {
        __MAX_NR_ZONES
};

#define MAX_NR_ZONES __MAX_NR_ZONES
#define MAX_PAGE_ORDER 10
#define MAX_ORDER_NR_PAGES (1 << MAX_PAGE_ORDER)

#define pageblock_order         MAX_PAGE_ORDER
#define pageblock_nr_pages      BIT(pageblock_order)
#define pageblock_align(pfn)    ALIGN((pfn), pageblock_nr_pages)
#define pageblock_start_pfn(pfn)        ALIGN_DOWN((pfn), pageblock_nr_pages)

struct zone {
        atomic_long_t           managed_pages;
};

typedef struct pglist_data {
        struct zone node_zones[MAX_NR_ZONES];

} pg_data_t;

#endif /* _LINUX_MMZONE_H */