avr32: convert to asm-generic/memory_model.h

Switch avr32/include/asm/page.h to use the common defintions for
pfn_to_page(), page_to_pfn(), and ARCH_PFN_OFFSET.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/avr32/include/asm/page.h

@@ -83,11 +83,9 @@ static inline int get_order(unsigned long size)
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
 
-#define PHYS_PFN_OFFSET		(CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
+#define ARCH_PFN_OFFSET		(CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
 
-#define pfn_to_page(pfn)	(mem_map + ((pfn) - PHYS_PFN_OFFSET))
-#define page_to_pfn(page)	((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET)
-#define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
+#define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr))
 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 
 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
@@ -101,4 +99,6 @@ static inline int get_order(unsigned long size)
  */
 #define HIGHMEM_START		0x20000000UL
 
+#include <asm-generic/memory_model.h>
+
 #endif /* __ASM_AVR32_PAGE_H */