mm/memory-failure: fix race in counting num_poisoned_pages
authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Thu, 6 Aug 2015 22:47:01 +0000 (15:47 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 7 Aug 2015 01:39:41 +0000 (04:39 +0300)
commita209ef09af0dc921311d0cc4a1d4f926321d91b8
treead921af093f96d72501e5c776380c72b65fbe1ea
parenta09233f3e1b77dbf50851660533e008056553a2a
mm/memory-failure: fix race in counting num_poisoned_pages

When memory_failure() is called on a page which are just freed after
page migration from soft offlining, the counter num_poisoned_pages is
raised twi= ce.  So let's fix it with using TestSetPageHWPoison.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Dean Nelson <dnelson@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/memory-failure.c