diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index bf116d0dbf23f8d3552e748719d76581f10aedb8..477841d29fce238a2888a7c0af0c7d05bc795524 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -71,14 +71,10 @@ void page_add_new_anon_rmap(struct page *, struct vm_area_struct *, unsigned lon
 void page_add_file_rmap(struct page *);
 void page_remove_rmap(struct page *);
 
-#ifdef CONFIG_DEBUG_VM
-void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address);
-#else
-static inline void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address)
+static inline void page_dup_rmap(struct page *page)
 {
 	atomic_inc(&page->_mapcount);
 }
-#endif
 
 /*
  * Called from mm/vmscan.c to handle paging out
diff --git a/mm/memory.c b/mm/memory.c
index 368561f32009d926d7de6687919d2879b69a3f41..7a61a11f186729aee519667f406235081450b2ce 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -597,7 +597,7 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 	page = vm_normal_page(vma, addr, pte);
 	if (page) {
 		get_page(page);
-		page_dup_rmap(page, vma, addr);
+		page_dup_rmap(page);
 		rss[!!PageAnon(page)]++;
 	}
 
diff --git a/mm/rmap.c b/mm/rmap.c
index 1406e67f961374da3d3ec06e9a0f65eeae38fb17..720fc03a7bc454de75fa86f542770ab9b9660788 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -710,27 +710,6 @@ void page_add_file_rmap(struct page *page)
 	}
 }
 
-#ifdef CONFIG_DEBUG_VM
-/**
- * page_dup_rmap - duplicate pte mapping to a page
- * @page:	the page to add the mapping to
- * @vma:	the vm area being duplicated
- * @address:	the user virtual address mapped
- *
- * For copy_page_range only: minimal extract from page_add_file_rmap /
- * page_add_anon_rmap, avoiding unnecessary tests (already checked) so it's
- * quicker.
- *
- * The caller needs to hold the pte lock.
- */
-void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address)
-{
-	if (PageAnon(page))
-		__page_check_anon_rmap(page, vma, address);
-	atomic_inc(&page->_mapcount);
-}
-#endif
-
 /**
  * page_remove_rmap - take down pte mapping from a page
  * @page: page to remove mapping from