#define pte_offset_kernel(dir, address) \
((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
#define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
-#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
#define pte_unmap(pte) do { } while (0)
-#define pte_unmap_nested(pte) do { } while (0)
struct vm_area_struct;
extern void update_mmu_cache(struct vm_area_struct * vma,