Commit f3ca10dd authored Apr 22, 2015 by Linus Torvalds

Revert "mm: avoid tail page refcounting on non-THP compound pages"



This reverts commit 8d63d99a.

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>

parent 5e6c94a9

include/linux/mm.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);
		}

		/*

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