linux-kernel - [PATCH 3/4] mm/hwpoison: fix false report 2nd try page recovery

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Message-Id: <1378125224-12794-3-git-send-email-liwanp@linux.vnet.ibm.com>
Date:	Mon,  2 Sep 2013 20:33:43 +0800
From:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Tony Luck <tony.luck@...el.com>, gong.chen@...ux.intel.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: [PATCH 3/4] mm/hwpoison: fix false report 2nd try page recovery

If the page is poisoned by software inject w/ MF_COUNT_INCREASED flag, there
is a false report 2nd try page recovery which is not truth, this patch fix it
by report first try free buddy page recovery if MF_COUNT_INCREASED is set.

Before patch:

[  346.332041] Injecting memory failure at pfn 200010
[  346.332189] MCE 0x200010: free buddy, 2nd try page recovery: Delayed

After patch:

[  297.742600] Injecting memory failure at pfn 200010
[  297.742941] MCE 0x200010: free buddy page recovery: Delayed

Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
 mm/memory-failure.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index b114570..6293164 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1114,8 +1114,10 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
 			 * shake_page could have turned it free.
 			 */
 			if (is_free_buddy_page(p)) {
-				action_result(pfn, "free buddy, 2nd try",
-						DELAYED);
+				if (flags & MF_COUNT_INCREASED)
+					action_result(pfn, "free buddy", DELAYED);
+				else
+					action_result(pfn, "free buddy, 2nd try", DELAYED);
 				return 0;
 			}
 			action_result(pfn, "non LRU", IGNORED);
-- 
1.7.5.4

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