mm/rmap.c: make page_referenced_one() and try_to_unmap_one() static

KSM was converted to use rmap_walk() and now nobody uses these functions
outside mm/rmap.c.

Let's covert them back to static.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/rmap.c b/mm/rmap.c
index 7da400d..8754e1f 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -671,7 +671,7 @@
 /*
  * arg: page_referenced_arg will be passed
  */
-int page_referenced_one(struct page *page, struct vm_area_struct *vma,
+static int page_referenced_one(struct page *page, struct vm_area_struct *vma,
 			unsigned long address, void *arg)
 {
 	struct mm_struct *mm = vma->vm_mm;
@@ -1114,7 +1114,7 @@
 /*
  * @arg: enum ttu_flags will be passed to this argument
  */
-int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
+static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
 		     unsigned long address, void *arg)
 {
 	struct mm_struct *mm = vma->vm_mm;