[PATCH] unify pfn_to_page: ppc pfn_to_page

PPC can use generic funcs.
Signed-off-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

include/asm-ppc/page.h

@@ -149,8 +149,7 @@ extern int page_is_ram(unsigned long pfn);
 #define __pa(x) ___pa((unsigned long)(x))
 #define __va(x) ((void *)(___va((unsigned long)(x))))
 
-#define pfn_to_page(pfn)	(mem_map + ((pfn) - PPC_PGSTART))
-#define page_to_pfn(page)	((unsigned long)((page) - mem_map) + PPC_PGSTART)
+#define ARCH_PFN_OFFSET		(PPC_PGSTART)
 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 #define page_to_virt(page)	__va(page_to_pfn(page) << PAGE_SHIFT)
 
@@ -175,5 +174,6 @@ extern __inline__ int get_order(unsigned long size)
 /* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
 #define __HAVE_ARCH_GATE_AREA		1
 
+#include <asm-generic/memory_model.h>
 #endif /* __KERNEL__ */
 #endif /* _PPC_PAGE_H */