[PATCH 4/4] sparsemem base: early_pfn_to_nid() (works before sparse is initialized)

[Dave Hansen <haveblue@us.ibm.com>]

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>
---

 arch/ia64/mm/numa.c                      |    0 
 memhotplug-dave/arch/i386/mm/discontig.c |   15 +++++++++++++++
 2 files changed, 15 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	2005-03-14 11:52:51.000000000 -0800
+++ memhotplug-dave/arch/i386/mm/discontig.c	2005-03-14 11:52:51.000000000 -0800
@@ -149,6 +149,21 @@ 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
diff -puN arch/ia64/mm/numa.c~B-sparse-130-add-early_pfn_to_nid arch/ia64/mm/numa.c
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