[PATCH] x86_64: Remove direct mem_map references

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.
Signed-off-by: Matt Tolentino <matthew.e.tolentino@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/x86_64/mm/init.c

@@ -68,8 +68,8 @@ void show_mem(void)
 
 	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))
@@ -437,7 +437,7 @@ void __init mem_init(void)
 		/*
 		 * 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