From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Fixes #error condition.

This check's meaning is:
--for 32bits--
4 (struct page's alignment) * PAGES_PER_SECTION % PAGE_SIZE == 0
--for 64bits--
8 (struct page's alignment) * PAGES_PER_SECTION % PAGE_SIZE == 0

Then, vmem_map is aligned per section.

This check may be removed if I (or someone) can write clean patch
for not aligned vmem_map.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 include/linux/mmzone.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN include/linux/mmzone.h~virtual-memmap-on-sparsemem-v3-generic-virtual-fix include/linux/mmzone.h
--- a/include/linux/mmzone.h~virtual-memmap-on-sparsemem-v3-generic-virtual-fix
+++ a/include/linux/mmzone.h
@@ -690,7 +690,7 @@ extern int __section_nr(struct mem_secti
 #define SECTION_NID_SHIFT	2
 
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
-#if (((BITS_PER_LONG/4) * PAGES_PER_SECTION) % PAGE_SIZE) != 0
+#if (((BITS_PER_LONG/8) * PAGES_PER_SECTION) % PAGE_SIZE) != 0
 #error "PAGE_SIZE/SECTION_SIZE relationship is not suitable for vmem_map"
 #endif
 extern struct page* mem_map;
_