tree 478a90a3b91ecb5902777a75362521506b7f7eb2
parent 94bf4ec84a84d3ab2513b4e681fd3d083328d76d
author Wanpeng Li <wanpeng.li@hotmail.com> 1441749798 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1441751728 -0700

mm/hwpoison: fix refcount of THP head page in no-injection case

Hwpoison injection takes a refcount of target page and another refcount
of head page of THP if the target page is the tail page of a THP.
However, current code doesn't release the refcount of head page if the
THP is not supported to be injected wrt hwpoison filter.

Fix it by reducing the refcount of head page if the target page is the
tail page of a THP and it is not supported to be injected.

Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>