Patch "mm/hwpoison: fix page refcount of unknown non LRU page" has been added to the 3.10-stable tree

Patch "mm/hwpoison: fix page refcount of unknown non LRU page" has been added to the 3.10-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mm/hwpoison: fix page refcount of unknown non LRU page

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mm-hwpoison-fix-page-refcount-of-unknown-non-lru-page.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 4f32be677b124a49459e2603321c7a5605ceb9f8 Mon Sep 17 00:00:00 2001
From: Wanpeng Li <wanpeng.li@hotmail.com>
Date: Fri, 14 Aug 2015 15:34:56 -0700
Subject: mm/hwpoison: fix page refcount of unknown non LRU page

From: Wanpeng Li <wanpeng.li@hotmail.com>

commit 4f32be677b124a49459e2603321c7a5605ceb9f8 upstream.

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@hotmail.com>
Acked-by: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 mm/memory-failure.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1473,6 +1473,8 @@ 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;


Patches currently in stable-queue which might be from wanpeng.li@hotmail.com are

queue-3.10/mm-hwpoison-fix-page-refcount-of-unknown-non-lru-page.patch