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mm: soft-offline: fix num_poisoned_pages counting on concurrent events 

commit 602498f9aa 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naoya Horiguchi 2015-05-05 16:23:46 -07:00 committed by Greg Kroah-Hartman
parent d869a155cf
commit bcce45b5e7
1 changed files with 4 additions and 4 deletions
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8
mm/memory-failure.c
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@ -1723,12 +1723,12 @@ 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);