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mm/hwpoison: fix failure to split thp w/ refcount held

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THP pages will get a refcount in madvise_hwpoison() w/
MF_COUNT_INCREASED flag, however, the refcount is still held when fail
to split THP pages.

Fix it by reducing the refcount of THP pages when fail to split THP.

Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wanpeng Li 2015-09-08 15:03:10 -07:00 committed by Linus Torvalds
parent 5dd2c4bded
commit 7d1900c744
1 changed files with 2 additions and 0 deletions
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2
mm/memory-failure.c
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@ -1725,6 +1725,8 @@ int soft_offline_page(struct page *page, int flags)
if (PageAnon(hpage) && unlikely(split_huge_page(hpage))) {
pr_info("soft offline: %#lx: failed to split THP\n",
pfn);
if (flags & MF_COUNT_INCREASED)
put_page(page);
return -EBUSY;
}
}