Index: linux-3.6/arch/powerpc/platforms/pseries/hotplug-memory.c
===================================================================
--- linux-3.6.orig/arch/powerpc/platforms/pseries/hotplug-memory.c	2012-10-05 14:33:09.516197839 +0900
+++ linux-3.6/arch/powerpc/platforms/pseries/hotplug-memory.c	2012-10-09 11:27:50.555709827 +0900
@@ -78,6 +78,7 @@ static int pseries_remove_memblock(unsig
  	unsigned long start, start_pfn;
  	struct zone *zone;
  	int ret;
+	unsigned long i, sections_to_remove;
  
  	start_pfn = base >> PAGE_SHIFT;
  
@@ -97,9 +98,13 @@ static int pseries_remove_memblock(unsig
  	 * to sysfs "state" file and we can't remove sysfs entries
  	 * while writing to it. So we have to defer it to here.
  	 */
-	ret = __remove_pages(zone, start_pfn, memblock_size >> PAGE_SHIFT);
-	if (ret)
-		return ret;
+	sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION;
+	for (i = 0; i < sections_to_remove; i++) {
+		unsigned long pfn = start_pfn + i * PAGES_PER_SECTION;
+		ret = __remove_pages(zone, start_pfn,  PAGES_PER_SECTION);
+		if (ret)
+			return ret;
+	}
  
  	/*
  	 * Update memory regions for memory remove
Index: linux-3.6/mm/memory_hotplug.c
===================================================================
--- linux-3.6.orig/mm/memory_hotplug.c	2012-10-05 15:21:42.856325965 +0900
+++ linux-3.6/mm/memory_hotplug.c	2012-10-05 15:21:43.047326148 +0900
@@ -596,11 +596,11 @@ int __remove_pages(struct zone *zone, un
  	BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK);
  	BUG_ON(nr_pages % PAGES_PER_SECTION);
  
+	release_mem_region(phys_start_pfn << PAGE_SHIFT, nr_pages * PAGE_SIZE);
+
  	sections_to_remove = nr_pages / PAGES_PER_SECTION;
  	for (i = 0; i < sections_to_remove; i++) {
  		unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION;
-		release_mem_region(pfn << PAGE_SHIFT,
-				   PAGES_PER_SECTION << PAGE_SHIFT);
  		ret = __remove_section(zone, __pfn_to_section(pfn));
  		if (ret)
  			break;