From patchwork Wed Nov  4 05:48:45 2009
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Andrew Morton <akpm@linux-foundation.org>
X-Patchwork-Id: 57463
Received: from vger.kernel.org (vger.kernel.org [209.132.176.167])
	by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id nA45nmkH001079
	for <patchwork-kvm@patchwork.kernel.org>; Wed, 4 Nov 2009 05:49:48 GMT
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1751365AbZKDFtJ (ORCPT
	<rfc822;patchwork-kvm@patchwork.kernel.org>);
	Wed, 4 Nov 2009 00:49:09 -0500
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751087AbZKDFtI
	(ORCPT <rfc822;kvm-outgoing>); Wed, 4 Nov 2009 00:49:08 -0500
Received: from smtp1.linux-foundation.org ([140.211.169.13]:35139 "EHLO
	smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK)
	by vger.kernel.org with ESMTP id S1751004AbZKDFtH (ORCPT
	<rfc822;kvm@vger.kernel.org>); Wed, 4 Nov 2009 00:49:07 -0500
Received: from imap1.linux-foundation.org (imap1.linux-foundation.org
	[140.211.169.55])
	by smtp1.linux-foundation.org (8.14.2/8.13.5/Debian-3ubuntu1.1) with
	ESMTP id nA45mmV9004229
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Tue, 3 Nov 2009 21:48:49 -0800
Received: from y.localdomain (localhost [127.0.0.1])
	by imap1.linux-foundation.org
	(8.13.5.20060308/8.13.5/Debian-3ubuntu1.1) with SMTP id
	nA45mjc1019743; Tue, 3 Nov 2009 21:48:47 -0800
Date: Tue, 3 Nov 2009 21:48:45 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: linux-kernel@vger.kernel.org, mm-commits@vger.kernel.org,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Tiago Vignatti <tiago.vignatti@nokia.com>,
	Dave Airlie <airlied@redhat.com>, kvm@vger.kernel.org,
	Greg KH <greg@kroah.com>, Kay Sievers <kay.sievers@vrfy.org>
Subject: Re: vga_arb warning [was: mmotm 2009-11-01-10-01 uploaded]
Message-Id: <20091103214845.9660895d.akpm@linux-foundation.org>
In-Reply-To: <4AEE01D9.8040902@gmail.com>
References: <200911011807.nA1I7o95016136@imap1.linux-foundation.org>
	<4AEE01D9.8040902@gmail.com>
X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.5; x86_64-redhat-linux-gnu)
Mime-Version: 1.0
X-Spam-Status: No, hits=-3.018 required=5 tests=AWL,BAYES_00
X-Spam-Checker-Version: SpamAssassin 3.2.4-osdl_revision__1.47__
X-MIMEDefang-Filter: lf$Revision: 1.188 $
X-Scanned-By: MIMEDefang 2.63 on 140.211.169.13
Sender: kvm-owner@vger.kernel.org
Precedence: bulk
List-ID: <kvm.vger.kernel.org>
X-Mailing-List: kvm@vger.kernel.org


--- a/fs/attr.c~notify_change-callers-must-hold-i_mutex
+++ a/fs/attr.c
@@ -155,6 +155,8 @@ int notify_change(struct dentry * dentry
 			return -EPERM;
 	}
 
+	WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
+
 	now = current_fs_time(inode->i_sb);
 
 	attr->ia_ctime = now;