Commit 161599ff authored Jan 06, 2006 by Andy Whitcroft Committed by Linus Torvalds Jan 06, 2006

[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>

parent 2bdaf115

include/linux/mmzone.h

+5 −1

Original line number	Diff line number	Diff line
		@@ -596,7 +596,11 @@ static inline int pfn_valid(unsigned long pfn)
		* 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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