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Subject[PATCH 2/2] sparse provide pfn_to_nid
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 <>
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.
-#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)); \
#define pfn_to_nid(pfn) (0)
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