[PATCH] ksm: fix m68k build: only NUMA needs pfn_to_nid

[Hugh Dickins]

A CONFIG_DISCONTIGMEM=y m68k config gave

mm/ksm.c: In function `get_kpfn_nid':
mm/ksm.c:492: error: implicit declaration of function `pfn_to_nid'

linux/mmzone.h declares it for CONFIG_SPARSEMEM and CONFIG_FLATMEM, but
expects the arch's asm/mmzone.h to declare it for CONFIG_DISCONTIGMEM
(see arch/mips/include/asm/mmzone.h for example).

Or perhaps it is only expected when CONFIG_NUMA=y: too much of a maze,
and m68k got away without it so far, so fix the build in mm/ksm.c.

Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---
Sorry, the non-ASCII quoting in the version I sent earlier threw
alpine into quoted-printable, hence a patch that would not apply:
I hope this version fares better.

 mm/ksm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 3.9-rc1/mm/ksm.c	2013-03-03 19:35:40.120006587 -0800
+++ linux/mm/ksm.c	2013-03-04 14:20:12.464047569 -0800
@@ -489,7 +489,7 @@ out:		page = NULL;
  */
 static inline int get_kpfn_nid(unsigned long kpfn)
 {
-	return ksm_merge_across_nodes ? 0 : pfn_to_nid(kpfn);
+	return ksm_merge_across_nodes ? 0 : NUMA(pfn_to_nid(kpfn));
 }
 
 static void remove_node_from_stable_tree(struct stable_node *stable_node)
--
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