diff options
author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2015-05-05 16:23:46 -0700 |
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committer | Sasha Levin <sasha.levin@oracle.com> | 2015-05-23 15:52:07 -0400 |
commit | 881241e8e37b2590ec8bcdce9dc554541010bb6a (patch) | |
tree | a915ee3e666b6fcfbde67dfb25c558e32d7b816a /mm | |
parent | 4e258a15e1037e05492a11cde68cb4ece0a21248 (diff) |
mm: soft-offline: fix num_poisoned_pages counting on concurrent events
[ Upstream commit 602498f9aa43d4951eece3fd6ad95a6d0a78d537 ]
If multiple soft offline events hit one free page/hugepage concurrently,
soft_offline_page() can handle the free page/hugepage multiple times,
which makes num_poisoned_pages counter increased more than once. This
patch fixes this wrong counting by checking TestSetPageHWPoison for normal
papes and by checking the return value of dequeue_hwpoisoned_huge_page()
for hugepages.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Dean Nelson <dnelson@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: <stable@vger.kernel.org> [3.14+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/memory-failure.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index f098ae8a519a..22f047fbaa33 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1733,12 +1733,12 @@ int soft_offline_page(struct page *page, int flags) } else if (ret == 0) { /* for free pages */ if (PageHuge(page)) { set_page_hwpoison_huge_page(hpage); - dequeue_hwpoisoned_huge_page(hpage); - atomic_long_add(1 << compound_order(hpage), + if (!dequeue_hwpoisoned_huge_page(hpage)) + atomic_long_add(1 << compound_order(hpage), &num_poisoned_pages); } else { - SetPageHWPoison(page); - atomic_long_inc(&num_poisoned_pages); + if (!TestSetPageHWPoison(page)) + atomic_long_inc(&num_poisoned_pages); } } unset_migratetype_isolate(page, MIGRATE_MOVABLE); |