From: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
Subject: mm/hwpoison: fix page refcount of unknown non LRU page
After trying to drain pages from pagevec/pageset, we try to get reference
count of the page again, however, the reference count of the page is not
reduced if the page is still not on LRU list.
Fix it by adding the put_page() to drop the page reference which is from
__get_any_page().
Signed-off-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [3.9+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/memory-failure.c~mm-hwpoison-fix-page-refcount-of-unkown-non-lru-page mm/memory-failure.c
--- a/mm/memory-failure.c~mm-hwpoison-fix-page-refcount-of-unkown-non-lru-page
+++ a/mm/memory-failure.c
@@ -1538,6 +1538,8 @@ static int get_any_page(struct page *pag
*/
ret = __get_any_page(page, pfn, 0);
if (!PageLRU(page)) {
+ /* Drop page reference which is from __get_any_page() */
+ put_page(page);
pr_info("soft_offline: %#lx: unknown non LRU page type %lx\n",
pfn, page->flags);
return -EIO;
_
--
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