void copy_page(void *to, void *from);
typedef unsigned long pte_t;
-typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
#define pte_val(x) (x)
-#define pmd_val(x) (x)
#define pgd_val(x) (x)
#define pgprot_val(x) (x)
#define __pte(x) (x)
-#define __pmd(x) (x)
#define __pgd(x) (x)
#define __pgprot(x) (x)