From 4f32be677b124a49459e2603321c7a5605ceb9f8 Mon Sep 17 00:00:00 2001 From: Wanpeng Li Date: Fri, 14 Aug 2015 15:34:56 -0700 Subject: [PATCH] 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 Acked-by: Naoya Horiguchi Cc: [3.9+] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory-failure.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index ea5a936..81c20a7 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1538,6 +1538,8 @@ static int get_any_page(struct page *page, unsigned long pfn, int flags) */ 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; -- 2.7.4