Move is_swap_pte helper function to swapops.h for use by pagemap code

Signed-off-by: Matt Mackall <mpm@selenic.com>

Index: l/include/linux/swapops.h
===================================================================
--- l.orig/include/linux/swapops.h	2007-10-09 17:36:25.000000000 -0500
+++ l/include/linux/swapops.h	2007-10-10 11:46:34.000000000 -0500
@@ -42,6 +42,12 @@ static inline pgoff_t swp_offset(swp_ent
 	return entry.val & SWP_OFFSET_MASK(entry);
 }
 
+/* check whether a pte points to a swap entry */
+static inline int is_swap_pte(pte_t pte)
+{
+	return !pte_none(pte) && !pte_present(pte) && !pte_file(pte);
+}
+
 /*
  * Convert the arch-dependent pte representation of a swp_entry_t into an
  * arch-independent swp_entry_t.
Index: l/mm/migrate.c
===================================================================
--- l.orig/mm/migrate.c	2007-10-09 17:37:59.000000000 -0500
+++ l/mm/migrate.c	2007-10-10 11:46:34.000000000 -0500
@@ -114,11 +114,6 @@ int putback_lru_pages(struct list_head *
 	return count;
 }
 
-static inline int is_swap_pte(pte_t pte)
-{
-	return !pte_none(pte) && !pte_present(pte) && !pte_file(pte);
-}
-
 /*
  * Restore a potential migration pte to a working pte entry
  */
-
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