[PATCH 1/2] mm/hwpoison: fix fail to split THP w/ refcount held

[Wanpeng Li <wanpeng.li@hotmail.com>]

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>
---
 mm/memory-failure.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 8077b1c..56b8a71 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1710,6 +1710,8 @@ 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;
 		}
 	}
-- 
1.7.1

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