peeling off zone from physical memory layout [8/10] power pc remove memory fix

Index: hogehoge/arch/powerpc/mm/mem.c
===================================================================
@@ -32,6 +32,7 @@
 #include <linux/highmem.h>
 #include <linux/initrd.h>
 #include <linux/pagemap.h>
+#include <linux/memorymap.h>
 
 #include <asm/pgalloc.h>
 #include <asm/prom.h>

@@ -163,7 +164,7 @@ int __devinit remove_memory(u64 start, u
 	 * not handling removing memory ranges that
 	 * overlap multiple zones yet
 	 */
-	if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages))
+	if (page_zone(pfn_to_page(start_pfn)) != page_zone(pfn_to_page(end_pfn - 1))
 		goto overlap;
 
 	/* make sure it is NOT in RMO */