We _know_ which node pages in general belong to, at least at a
very gross level in node_{start,end}_pfn[].  Use those to target
the allocations of pages.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---

 memhotplug-dave/arch/i386/mm/discontig.c |   15 +++++++++++++++
 memhotplug-dave/arch/ppc64/mm/numa.c     |   19 +++++++++++++++++++
 2 files changed, 34 insertions(+)

diff -puN arch/i386/mm/discontig.c~B-sparse-130-add-early_pfn_to_nid arch/i386/mm/discontig.c
--- memhotplug/arch/i386/mm/discontig.c~B-sparse-130-add-early_pfn_to_nid	2005-03-03 09:05:02.000000000 -0800
+++ memhotplug-dave/arch/i386/mm/discontig.c	2005-03-03 09:05:02.000000000 -0800
@@ -148,6 +148,21 @@ static void __init find_max_pfn_node(int
 		BUG();
 }
 
+/* Find the owning node for a pfn. */
+int early_pfn_to_nid(unsigned long pfn)
+{
+	int nid;
+
+	for_each_node(nid) {
+		if (node_end_pfn[nid] == 0)
+			break;
+		if (node_start_pfn[nid] <= pfn && node_end_pfn[nid] >= pfn)
+			return nid;
+	}
+
+	return 0;
+}
+
 /* 
  * Allocate memory for the pg_data_t for this node via a crude pre-bootmem
  * method.  For node zero take this from the bottom of memory, for
diff -puN arch/ppc64/mm/numa.c~B-sparse-130-add-early_pfn_to_nid arch/ppc64/mm/numa.c
--- memhotplug/arch/ppc64/mm/numa.c~B-sparse-130-add-early_pfn_to_nid	2005-03-03 09:05:02.000000000 -0800
+++ memhotplug-dave/arch/ppc64/mm/numa.c	2005-03-03 09:05:02.000000000 -0800
@@ -671,3 +671,22 @@ static int __init early_numa(char *p)
 	return 0;
 }
 early_param("numa", early_numa);
+
+/* Find the owning node for a pfn. */
+int early_pfn_to_nid(unsigned long pfn)
+{
+	int nid;
+	unsigned long start, end;
+
+	for_each_node(nid) {
+		if(!init_node_data[nid].node_spanned_pages)
+			break;
+
+		start = init_node_data[nid].node_start_pfn;
+		end = start + init_node_data[nid].node_spanned_pages;
+		if (start <= pfn && pfn <= end)
+			return nid;
+	}
+
+	return 0;
+}
_