From f3ca10dde49043fbbb055854278b26954b549b36 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 22 Apr 2015 09:44:36 -0700
Subject: [PATCH] Revert "mm: avoid tail page refcounting on non-THP compound
 pages"

This reverts commit 8d63d99a5dfbdb997d12dd3c07b2070ca723db3b.

It causes in VM mapping refcount errors:

  page:ffffea0010a15040 count:0 mapcount:1 mapping:          (null) index:0x0
  flags: 0x8000000000008014(referenced|dirty|tail)
  page dumped because: VM_BUG_ON_PAGE(page_mapcount(page) != 0)
  ------------[ cut here ]------------
  kernel BUG at mm/swap.c:134!

as reported by Borislav Petkov

Reported-and-tested-by: Borislav Petkov <bp@alien8.de>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/mm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8b086070c3a5..0755b9fd03a7 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -499,7 +499,7 @@ static inline int page_count(struct page *page)
 
 static inline bool __compound_tail_refcounted(struct page *page)
 {
-	return PageAnon(page) && !PageSlab(page) && !PageHeadHuge(page);
+	return !PageSlab(page) && !PageHeadHuge(page);
 }
 
 /*
-- 
2.20.1