[RFC][PATCH] unify pfn_to_page [2/25] alpha page_to_pfn / pfn_to_page

[RFC][PATCH] unify pfn_to_page [2/25] alpha page_to_pfn / pfn_to_page

[KAMEZAWA Hiroyuki]

drop alpha's page_to_pfn/pfn_to_page().

When Discontigmem :
Original pfn_to_page looks complicated. it used
pa_to_nid(__pa(__va(pfn << PAGE_SHIFT))),but it is same to pfn_to_nid(pfn).

local_mapnr(__va((pfn) << PAGE_SHIFT) was
__pa (__va(pfn) << PAGE_SHIFT)) >> PAGE_SHIFT - NODE_DATA(nid)->node_start_pfn.
but it is equivalent to  pfn - NODE_DATA(nid)->node_start_pfn.

Alpha seems to be able to use generic ones.
Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Index: cleanup_pfn_page/include/asm-alpha/mmzone.h
===================================================================
--- cleanup_pfn_page.orig/include/asm-alpha/mmzone.h
+++ cleanup_pfn_page/include/asm-alpha/mmzone.h
@@ -59,8 +59,6 @@ PLAT_NODE_DATA_LOCALNR(unsigned long p,
  #define kvaddr_to_nid(kaddr)	pa_to_nid(__pa(kaddr))
  #define node_start_pfn(nid)	(NODE_DATA(nid)->node_start_pfn)

-#define local_mapnr(kvaddr) \
-      ((__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr)))

  /*
   * Given a kaddr, LOCAL_BASE_ADDR finds the owning node of the memory
@@ -104,15 +102,6 @@ PLAT_NODE_DATA_LOCALNR(unsigned long p,
  	__xx;                                                           \
  })

-#define pfn_to_page(pfn)						\
-({									\
- 	unsigned long kaddr = (unsigned long)__va((pfn) << PAGE_SHIFT);	\
-	(NODE_DATA(kvaddr_to_nid(kaddr))->node_mem_map + local_mapnr(kaddr));	\
-})
-
-#define page_to_pfn(page)						\
-	((page) - page_zone(page)->zone_mem_map +			\
-	 (page_zone(page)->zone_start_pfn))

  #define page_to_pa(page)						\
  	((( (page) - page_zone(page)->zone_mem_map )			\
@@ -125,6 +114,9 @@ PLAT_NODE_DATA_LOCALNR(unsigned long p,

  #define virt_addr_valid(kaddr)	pfn_valid((__pa(kaddr) >> PAGE_SHIFT))

+
+#define arch_pfn_to_nid(pfn)	pfn_to_nid(pfn)
+
  #endif /* CONFIG_DISCONTIGMEM */

  #endif /* _ASM_MMZONE_H_ */
Index: cleanup_pfn_page/include/asm-alpha/page.h
===================================================================
--- cleanup_pfn_page.orig/include/asm-alpha/page.h
+++ cleanup_pfn_page/include/asm-alpha/page.h
@@ -85,8 +85,6 @@ typedef unsigned long pgprot_t;
  #define __pa(x)			((unsigned long) (x) - PAGE_OFFSET)
  #define __va(x)			((void *)((unsigned long) (x) + PAGE_OFFSET))
  #ifndef CONFIG_DISCONTIGMEM
-#define pfn_to_page(pfn)	(mem_map + (pfn))
-#define page_to_pfn(page)	((unsigned long)((page) - mem_map))
  #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

  #define pfn_valid(pfn)		((pfn) < max_mapnr)