2 files changed, 13 insertions, 51 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 839d9e9a1c38..34387351930c 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -466,44 +466,9 @@ static inline int page_count(struct page *page)
 	return atomic_read(&compound_head(page)->_count);
 }
 
-static inline bool __compound_tail_refcounted(struct page *page)
-{
-	return PageAnon(page) && !PageSlab(page) && !PageHeadHuge(page);
-}
-
-/*
- * This takes a head page as parameter and tells if the
- * tail page reference counting can be skipped.
- *
- * For this to be safe, PageSlab and PageHeadHuge must remain true on
- * any given page where they return true here, until all tail pins
- * have been released.
- */
-static inline bool compound_tail_refcounted(struct page *page)
-{
-	VM_BUG_ON_PAGE(!PageHead(page), page);
-	return __compound_tail_refcounted(page);
-}
-
-static inline void get_huge_page_tail(struct page *page)
-{
-	/*
-	 * __split_huge_page_refcount() cannot run from under us.
-	 */
-	VM_BUG_ON_PAGE(!PageTail(page), page);
-	VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
-	VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page);
-	if (compound_tail_refcounted(compound_head(page)))
-		atomic_inc(&page->_mapcount);
-}
-
-extern bool __get_page_tail(struct page *page);
-
 static inline void get_page(struct page *page)
 {
-	if (unlikely(PageTail(page)))
-		if (likely(__get_page_tail(page)))
-			return;
+	page = compound_head(page);
 	/*
 	 * Getting a normal page or the head of a compound page
 	 * requires to already have an elevated page->_count.
@@ -528,7 +493,15 @@ static inline void init_page_count(struct page *page)
 	atomic_set(&page->_count, 1);
 }
 
-void put_page(struct page *page);
+void __put_page(struct page *page);
+
+static inline void put_page(struct page *page)
+{
+	page = compound_head(page);
+	if (put_page_testzero(page))
+		__put_page(page);
+}
+
 void put_pages_list(struct list_head *pages);
 
 void split_page(struct page *page, unsigned int order);
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 6bc9a0ce2253..faf6fe88d6b3 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -81,20 +81,9 @@ struct page {
 
 				union {
 					/*
-					 * Count of ptes mapped in
-					 * mms, to show when page is
-					 * mapped & limit reverse map
-					 * searches.
-					 *
-					 * Used also for tail pages
-					 * refcounting instead of
-					 * _count. Tail pages cannot
-					 * be mapped and keeping the
-					 * tail page _count zero at
-					 * all times guarantees
-					 * get_page_unless_zero() will
-					 * never succeed on tail
-					 * pages.
+					 * Count of ptes mapped in mms, to show
+					 * when page is mapped & limit reverse
+					 * map searches.
 					 */
 					atomic_t _mapcount;