[3.13.y-ckt stable] Patch "mm/hwpoison: fix page refcount of unknown non LRU page" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Tue Sep 22 00:32:44 UTC 2015


This is a note to let you know that I have just added a patch titled

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

to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11-ckt27.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 0cc1cdb1bb32f8f54ed698256ed503ca6780976f Mon Sep 17 00:00:00 2001
From: Wanpeng Li <wanpeng.li at hotmail.com>
Date: Fri, 14 Aug 2015 15:34:56 -0700
Subject: mm/hwpoison: fix page refcount of unknown non LRU page

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 at hotmail.com>
Acked-by: Naoya Horiguchi <n-horiguchi at ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 mm/memory-failure.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 95ebdc0..f2699c3 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1510,6 +1510,8 @@ 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;
--
1.9.1





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