From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932451AbdDRRTn (ORCPT ); Tue, 18 Apr 2017 13:19:43 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:35324 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753989AbdDRRTm (ORCPT ); Tue, 18 Apr 2017 13:19:42 -0400 Date: Tue, 18 Apr 2017 10:19:38 -0700 From: "Paul E. McKenney" To: Johannes Berg Cc: Nicolai Stange , Greg Kroah-Hartman , linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances Reply-To: paulmck@linux.vnet.ibm.com References: <871stdyg0u.fsf@gmail.com> <20170416095137.2784-1-nicstange@gmail.com> <20170416095137.2784-10-nicstange@gmail.com> <20170417160121.GP3956@linux.vnet.ibm.com> <1492508367.2472.9.camel@sipsolutions.net> <20170418133136.GS3956@linux.vnet.ibm.com> <1492522832.18845.1.camel@sipsolutions.net> <20170418151700.GU3956@linux.vnet.ibm.com> <1492528838.18845.3.camel@sipsolutions.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1492528838.18845.3.camel@sipsolutions.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 17041817-0044-0000-0000-0000030ABC4C X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006936; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000208; SDB=6.00849218; UDB=6.00419307; IPR=6.00627859; BA=6.00005298; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00015085; XFM=3.00000013; UTC=2017-04-18 17:19:40 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17041817-0045-0000-0000-00000738C240 Message-Id: <20170418171938.GW3956@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-04-18_14:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1704180136 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 18, 2017 at 05:20:38PM +0200, Johannes Berg wrote: > On Tue, 2017-04-18 at 08:17 -0700, Paul E. McKenney wrote: > > > > Again, no (S)RCU abuse here, just an ABBA deadlock. > > > > OK, please accept my apologies for failing to follow the thread. > > No worries - just wanted to clarify this in case I was missing > something. > > > I nevertheless reiterate my advice to run at least some tests with > > CONFIG_PROVE_RCU=y.  And yes, it would be good to upgrade lockdep > > to find the above theoretical deadlock. > > Right. It won't matter for debugfs after this patchset, but it would > indeed be nice - I failed in my attempt though :) Hey, I was hoping! ;-) Thanx, Paul