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

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

[KAMEZAWA Hiroyuki]

This is a patch against remove_memory().
I think this patch is not very good, but remove_memory() will fail
in current kernel anyway.

Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>


Index: hogehoge/arch/powerpc/mm/mem.c
===================================================================
--- hogehoge.orig/arch/powerpc/mm/mem.c
+++ 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 */

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