[patch] remove direct mem_map refs for x86-64

[Matt Tolentino <metolent@snoqualmie.dp.intel.com>]

Hi Andi,

No real functional change here.  Just use the pfn_to_page
macros instead of directly indexing into the mem_map. 
Patch is against 2.6.10-rc1-mm2.  Please consider...

matt

Signed-off-by: Matt Tolentino <matthew.e.tolentino@intel.com>

This removes all but one direct reference to mem_map
for x86-64.  This is needed on systems where we 
break the mem_map up and directly indexing into 
mem_map to get the page structure doesn't work anymore.


diff -urN linux-2.6.10-rc1-mm2-vanilla/arch/x86_64/mm/init.c linux-2.6.10-rc1-mm2/arch/x86_64/mm/init.c
--- linux-2.6.10-rc1-mm2-vanilla/arch/x86_64/mm/init.c	2004-11-03 06:40:21.501214144 -0500
+++ linux-2.6.10-rc1-mm2/arch/x86_64/mm/init.c	2004-11-03 06:20:34.000000000 -0500
@@ -68,8 +68,8 @@
 
 	for_each_pgdat(pgdat) {
                for (i = 0; i < pgdat->node_spanned_pages; ++i) {
-                       page = pgdat->node_mem_map + i;
-		total++;
+			page = pfn_to_page(pgdat->node_start_pfn + i);
+			total++;
                        if (PageReserved(page))
 			reserved++;
                        else if (PageSwapCache(page))
@@ -466,7 +466,7 @@
 		/*
 		 * Only count reserved RAM pages
 		 */
-		if (page_is_ram(tmp) && PageReserved(mem_map+tmp))
+		if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
 			reservedpages++;
 #endif