nios2: drop _PAGE_FILE and pte_file()-related helpers

We've replaced remap_file_pages(2) implementation with emulation.  Nobody
creates non-linear mapping anymore.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Ley Foon Tan <lftan@altera.com>
Reviewed-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/nios2/include/asm/pgtable-bits.h

@@ -30,6 +30,5 @@
 #define _PAGE_PRESENT	(1<<25)	/* PTE contains a translation */
 #define _PAGE_ACCESSED	(1<<26)	/* page referenced */
 #define _PAGE_DIRTY	(1<<27)	/* dirty page */
-#define _PAGE_FILE	(1<<28)	/* PTE used for file mapping or swap */
 
 #endif /* _ASM_NIOS2_PGTABLE_BITS_H */

arch/nios2/include/asm/pgtable.h

@@ -112,8 +112,6 @@ static inline int pte_dirty(pte_t pte)		\
 	{ return pte_val(pte) & _PAGE_DIRTY; }
 static inline int pte_young(pte_t pte)		\
 	{ return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_file(pte_t pte)		\
-	{ return pte_val(pte) & _PAGE_FILE; }
 static inline int pte_special(pte_t pte)	{ return 0; }
 
 #define pgprot_noncached pgprot_noncached
@@ -272,8 +270,7 @@ static inline void pte_clear(struct mm_struct *mm,
 		__FILE__, __LINE__, pgd_val(e))
 
 /*
- * Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte)
- * && !pte_file(pte)):
+ * Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte):
  *
  * 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ...  1  0
  *  0  0  0  0 type.  0  0  0  0  0  0 offset.........
@@ -290,11 +287,6 @@ static inline void pte_clear(struct mm_struct *mm,
 #define __swp_entry_to_pte(swp)	((pte_t) { (swp).val })
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 
-/* Encode and decode a nonlinear file mapping entry */
-#define PTE_FILE_MAX_BITS	25
-#define pte_to_pgoff(pte)	(pte_val(pte) & 0x1ffffff)
-#define pgoff_to_pte(off)	__pte(((off) & 0x1ffffff) | _PAGE_FILE)
-
 #define kern_addr_valid(addr)		(1)
 
 #include <asm-generic/pgtable.h>