linux-kernel - [PATCH] mm: migration: pair unlock_page and lock

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Date:	Fri, 25 Nov 2011 20:20:31 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: [PATCH] mm: migration: pair unlock_page and lock_page when migrating
 huge pages

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

Signed-off-by: Hillf Danton <dhillf@...il.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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