buddy.h

#ifndef OS_MM_H
#define OS_MM_H
#define MAX_ERRNO 4095

#define OK          0
#define EINVAL      22  /* Invalid argument */    
#define ENOSPC      28  /* No page left */  

#define LOG4K 12

#define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
static inline void *ERR_PTR(long error) { return (void *)error; }
static inline long PTR_ERR(const void *ptr) { return (long)ptr; }
static inline long IS_ERR(const void *ptr) { return IS_ERR_VALUE((unsigned long)ptr); }

typedef struct node_ node;

int merge_page(int rank,node *cur);
void insert(int rank,void *pos);

int init_page(void *p, int pgcount);
void *alloc_pages(int rank);
int return_pages(void *p);
int query_ranks(void *p);
int query_page_counts(int rank);

#endif