[PATCH 2/2] sparse provide pfn_to_nid

[Andy Whitcroft <apw@shadowen.org>]

sparsemem: provide pfn_to_nid

Before SPARSEMEM is initialised we cannot provide an efficient
pfn_to_nid() implmentation; before initialisation is complete we use
early_pfn_to_nid() to provide location information.  Until recently
there was no non-init user of this functionality.  Provide a post
init pfn_to_nid() implementation.

Note that this implmentation assumes that the pfn passed has
been validated with pfn_valid().  The current single user of this
function already has this check.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
---
 mmzone.h |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletion(-)
diff -upN reference/include/linux/mmzone.h current/include/linux/mmzone.h
--- reference/include/linux/mmzone.h
+++ current/include/linux/mmzone.h
@@ -606,7 +606,11 @@ static inline int pfn_valid(unsigned lon
  * this restriction.
  */
 #ifdef CONFIG_NUMA
-#define pfn_to_nid		early_pfn_to_nid
+#define pfn_to_nid(pfn)							\
+({									\
+	unsigned long __pfn_to_nid_pfn = (pfn);				\
+	page_to_nid(pfn_to_page(__pfn_to_nid_pfn));			\
+})
 #else
 #define pfn_to_nid(pfn)		(0)
 #endif
-
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