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mm/memory-failure: fix race in counting num_poisoned_pages

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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>
This commit is contained in:
Naoya Horiguchi 2015-08-06 15:47:01 -07:00 committed by Linus Torvalds
parent a09233f3e1
commit a209ef09af
1 changed files with 2 additions and 2 deletions
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4
mm/memory-failure.c
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@ -1671,8 +1671,8 @@ static int __soft_offline_page(struct page *page, int flags)
if (ret > 0)
ret = -EIO;
} else {
SetPageHWPoison(page);
atomic_long_inc(&num_poisoned_pages);
if (!TestSetPageHWPoison(page))
atomic_long_inc(&num_poisoned_pages);
}
} else {
pr_info("soft offline: %#lx: isolation failed: %d, page count %d, type %lx\n",