Memoryless Nodes: No need for kswapd

A node without memory does not need a kswapd. So use the memory map instead
of the online map when starting kswapd.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Acked-by: Nishanth Aravamudan <nacc@us.ibm.com>

Index: linux-2.6.22-rc4-mm2/mm/vmscan.c
===================================================================
--- linux-2.6.22-rc4-mm2.orig/mm/vmscan.c	2007-06-18 11:46:25.000000000 -0700
+++ linux-2.6.22-rc4-mm2/mm/vmscan.c	2007-06-18 11:49:47.000000000 -0700
@@ -1735,7 +1735,7 @@ static int __init kswapd_init(void)
 	int nid;
 
 	swap_setup();
-	for_each_online_node(nid)
+	for_each_node_state(nid, N_MEMORY)
  		kswapd_run(nid);
 	hotcpu_notifier(cpu_callback, 0);
 	return 0;