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Date: Fri, 25 Nov 2011 20:20:31 +0800
Message-ID: <CAJd=RBChfVC4hUKvO5ks0+NxahTgibdivLotw3VpAa7_-r8_+g@mail.gmail.com>
Subject: [PATCH] mm: migration: pair unlock_page and lock_page when migrating
 huge pages
From: Hillf Danton <dhillf@gmail.com>
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Sender: owner-linux-mm@kvack.org
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To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, LKML <linux-kernel@vger.kernel.org>, linux-mm@kvack.org

Skip unlocking page if fail to lock, then lock and unlock are paired.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
---

--- a/mm/migrate.c	Fri Nov 25 20:11:14 2011
+++ b/mm/migrate.c	Fri Nov 25 20:21:26 2011
@@ -869,9 +869,9 @@ static int unmap_and_move_huge_page(new_

 	if (anon_vma)
 		put_anon_vma(anon_vma);
-out:
 	unlock_page(hpage);

+out:
 	if (rc != -EAGAIN) {
 		list_del(&hpage->lru);
 		put_page(hpage);

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