[PATCH] 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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index ee9f7b7..8cba76c 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -596,7 +596,11 @@
* 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