linux-kernel - [PATCH] hwpoison: always unset MIGRATE_ISOLATE before returning from soft_offline

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Date:	Thu, 22 Aug 2013 15:20:47 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Andi Kleen <andi@...stfloor.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Tony Luck <tony.luck@...el.com>, gong.chen@...ux.intel.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] hwpoison: always unset MIGRATE_ISOLATE before returning from
 soft_offline_page()

Soft offline code expects that MIGRATE_ISOLATE is set on the target page
only during soft offlining work. But currenly it doesn't work as expected
when get_any_page() fails and returns negative value. In the result, end
users can have unexpectedly isolated pages. This patch just fixes it.

Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---
 mm/memory-failure.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index af6f61c..1cb3b7d 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1550,7 +1550,7 @@ int soft_offline_page(struct page *page, int flags)
 
 	ret = get_any_page(page, pfn, flags);
 	if (ret < 0)
-		return ret;
+		goto unset;
 	if (ret) { /* for in-use pages */
 		if (PageHuge(page))
 			ret = soft_offline_huge_page(page, flags);
@@ -1567,6 +1567,7 @@ int soft_offline_page(struct page *page, int flags)
 			atomic_long_inc(&num_poisoned_pages);
 		}
 	}
+unset:
 	unset_migratetype_isolate(page, MIGRATE_MOVABLE);
 	return ret;
 }
-- 
1.8.3.1
--
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