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>

include/linux/rmap.h

@@ -183,14 +183,10 @@ static inline void page_dup_rmap(struct page *page)
  */
 int page_referenced(struct page *, int is_locked,
 			struct mem_cgroup *memcg, unsigned long *vm_flags);
-int page_referenced_one(struct page *, struct vm_area_struct *,
-	unsigned long address, void *arg);
 
 #define TTU_ACTION(x) ((x) & TTU_ACTION_MASK)
 
 int try_to_unmap(struct page *, enum ttu_flags flags);
-int try_to_unmap_one(struct page *, struct vm_area_struct *,
-			unsigned long address, void *arg);
 
 /*
  * Called from mm/filemap_xip.c to unmap empty zero page

mm/rmap.c

@@ -671,7 +671,7 @@ struct page_referenced_arg {
 /*
  * 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 @@ void page_remove_rmap(struct page *page)
 /*
  * @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;