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[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>
This commit is contained in:
Andy Whitcroft 2006-01-06 00:10:54 -08:00 committed by Linus Torvalds
parent 2bdaf115b1
commit 161599ff39
1 changed files with 5 additions and 1 deletions
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6
include/linux/mmzone.h
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@ -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