[PATCH] 2.6.23-rc3-mm1 - update N_HIGH_MEMORY node state for memory hotadd

[Lee Schermerhorn <Lee.Schermerhorn@hp.com>]

I believe [something like] the following is required for memory hot add,
after moving the setting of N_HIGH_MEMORY node state to
free_area_init_nodes().  However, we could also move that BACK to
__build_all_zonelists() BEFORE calling build_zonelists() and dispense
with this patch.

Thoughts?  [besides the obvious churn, I mean.  :-\]

Lee
=================

PATCH update N_HIGH_MEMORY node state for memory hotadd

Against:  2.6.23-rc3-mm1

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>

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

Index: Linux/mm/memory_hotplug.c
===================================================================
--- Linux.orig/mm/memory_hotplug.c	2007-08-22 09:20:26.000000000 -0400
+++ Linux/mm/memory_hotplug.c	2007-08-27 10:40:57.000000000 -0400
@@ -211,6 +211,8 @@ int online_pages(unsigned long pfn, unsi
 		online_pages_range);
 	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();
 


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