From: Andrew Morton <akpm@linux-foundation.org>

mm/mlock.c: In function 'mlock_fixup':
mm/mlock.c:468: error: implicit declaration of function '__mlock_posix_error_return'

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Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mlock.c |   30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff -puN mm/mlock.c~mlock-make-mlock-error-return-posixly-correct-fix mm/mlock.c
--- a/mm/mlock.c~mlock-make-mlock-error-return-posixly-correct-fix
+++ a/mm/mlock.c
@@ -143,18 +143,6 @@ static void munlock_vma_page(struct page
 	}
 }
 
-/*
- * convert get_user_pages() return value to posix mlock() error
- */
-static int __mlock_posix_error_return(long retval)
-{
-	if (retval == -EFAULT)
-		retval = -ENOMEM;
-	else if (retval == -ENOMEM)
-		retval = -EAGAIN;
-	return retval;
-}
-
 /**
  * __mlock_vma_pages_range() -  mlock/munlock a range of pages in the vma.
  * @vma:   target vma
@@ -268,6 +256,18 @@ static long __mlock_vma_pages_range(stru
 	return ret;	/* count entire vma as locked_vm */
 }
 
+/*
+ * convert get_user_pages() return value to posix mlock() error
+ */
+static int __mlock_posix_error_return(long retval)
+{
+	if (retval == -EFAULT)
+		retval = -ENOMEM;
+	else if (retval == -ENOMEM)
+		retval = -EAGAIN;
+	return retval;
+}
+
 #else /* CONFIG_UNEVICTABLE_LRU */
 
 /*
@@ -281,6 +281,12 @@ static long __mlock_vma_pages_range(stru
 		return make_pages_present(start, end);
 	return 0;
 }
+
+static inline int __mlock_posix_error_return(long retval)
+{
+	return 0;
+}
+
 #endif /* CONFIG_UNEVICTABLE_LRU */
 
 /**
_