From: Lee Schermerhorn <Lee.Schermerhorn@hp.com>

Setting N_HIGH_MEMORY node state in free_area_init_nodes() works for memory
present at boot time, but not for hot-added memory.  Update the
N_HIGH_MEMORY node state in online_pages(), if we've added pages to this
node, before rebuilding zonelists.

Signed-off-by:  Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Eric Whitney <eric.whitney@hp.com>
Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory_hotplug.c |    2 ++
 1 files changed, 2 insertions(+)

diff -puN mm/memory_hotplug.c~update-n_high_memory-node-state-for-memory-hotadd mm/memory_hotplug.c
--- a/mm/memory_hotplug.c~update-n_high_memory-node-state-for-memory-hotadd
+++ a/mm/memory_hotplug.c
@@ -215,6 +215,8 @@ int online_pages(unsigned long pfn, unsi
 	}
 	zone->present_pages += onlined_pages;
 	zone->zone_pgdat->node_present_pages += onlined_pages;
+	if (onlined_pages)
+		node_set_state(zone->node, N_HIGH_MEMORY);
 
 	setup_per_zone_pages_min();
 
_