[Patch]Tiny bug fix of memory hotadd (pgdat->node_present_pages are not correct).

[Yasunori Goto <y-goto@jp.fujitsu.com>]

Hello.

This patch is tiny bug fix for memory hotplug.

When pages are onlined, not only zone->present_pages 
but also pgdat->node_present_pages should be refreshed.

This parameter is used to show information at
/sys/device/system/node/nodeX/meminfo 
via si_meminfo_node().

So, it shows strange value for MemUsed which is calculated
(node_present_pages - all zones free pages).

This patch is for 2.6.16-rc5-mm3.
And I tested this on my hotplug emulation environment.

Please apply.

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>

Index: pgdat7/mm/memory_hotplug.c
===================================================================
--- pgdat7.orig/mm/memory_hotplug.c	2006-03-09 18:32:11.000000000 +0900
+++ pgdat7/mm/memory_hotplug.c	2006-03-09 18:34:34.000000000 +0900
@@ -130,6 +130,7 @@ int online_pages(unsigned long pfn, unsi
 		onlined_pages++;
 	}
 	zone->present_pages += onlined_pages;
+	zone->zone_pgdat->node_present_pages += onlined_pages;
 
 	setup_per_zone_pages_min();
 

-- 
Yasunori Goto