[Patch] 3/5 in support of hot-add memory x86_64 arch_find_node x86_64

[keith mannthey <kmannth@us.ibm.com>]

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Hello all
  This is a enablement of the generic arch_find_node for x86_64. It uses
the nodes_add date collected from the SRAT to do it's lookup. 

I suspect and i386 version will be needed when I get to that arch with
my work. 

This was built against 2.6.18-rc2.

Signed-off-by:  Keith Mannthey <kmannth@us.ibm.com>

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diff -urN orig/arch/x86_64/Kconfig work/arch/x86_64/Kconfig
--- orig/arch/x86_64/Kconfig	2006-07-28 13:57:35.000000000 -0400
+++ work/arch/x86_64/Kconfig	2006-07-28 21:20:16.000000000 -0400
@@ -343,6 +343,10 @@
 	def_bool y
 	depends on MEMORY_HOTPLUG
 
+config ARCH_FIND_NODE
+	def_bool y
+	depends on MEMORY_HOTPLUG
+
 config ARCH_FLATMEM_ENABLE
 	def_bool y
 	depends on !NUMA
diff -urN orig/arch/x86_64/mm/srat.c work/arch/x86_64/mm/srat.c
--- orig/arch/x86_64/mm/srat.c	2006-07-28 13:57:35.000000000 -0400
+++ work/arch/x86_64/mm/srat.c	2006-07-28 21:19:01.000000000 -0400
@@ -450,3 +450,15 @@
 }
 
 EXPORT_SYMBOL(__node_distance);
+
+int arch_find_node(unsigned long start, unsigned long size) 
+{
+	int i, ret = 0;
+	unsigned long end = start+size;
+	
+	for_each_node(i) {
+		if (nodes_add[i].start <= start && nodes_add[i].end >= end)
+			ret = i;
+	}
+	return ret;
+}