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| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2015-08-06 15:47:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-08-07 04:39:41 +0300 |
| commit | a209ef09af0dc921311d0cc4a1d4f926321d91b8 (patch) | |
| tree | ad921af093f96d72501e5c776380c72b65fbe1ea /mm/memory-failure.c | |
| parent | a09233f3e1b77dbf50851660533e008056553a2a (diff) | |
| download | lwn-a209ef09af0dc921311d0cc4a1d4f926321d91b8.tar.gz lwn-a209ef09af0dc921311d0cc4a1d4f926321d91b8.zip | |
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>
Diffstat (limited to 'mm/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 04d677048af7..f72d2fad0b90 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -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", |