Commit 7d1900c7 authored Sep 08, 2015 by Wanpeng Li Committed by Linus Torvalds Sep 08, 2015

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



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>

parent 5dd2c4bd

mm/memory-failure.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}
		}

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