diff options
| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2015-05-05 16:23:46 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-05-16 09:12:44 +0200 |
| commit | 5babf6ec822b6fd79e8941dd3b1c7aa58d8620f6 (patch) | |
| tree | 894f230e68ad05474b4cb9f62bde708c3876db0e /mm | |
| parent | 62d7a1a87954f16f6c43d345f347afc2a0ee80ac (diff) | |
mm: soft-offline: fix num_poisoned_pages counting on concurrent events
commit 602498f9aa43d4951eece3fd6ad95a6d0a78d537 upstream.
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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 2e94ad1133af..5785b59620ef 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1718,12 +1718,12 @@ int soft_offline_page(struct page *page, int flags) } else { /* 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: |