From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754795AbdDRPUo (ORCPT ); Tue, 18 Apr 2017 11:20:44 -0400 Received: from s3.sipsolutions.net ([5.9.151.49]:52882 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754114AbdDRPUn (ORCPT ); Tue, 18 Apr 2017 11:20:43 -0400 Message-ID: <1492528838.18845.3.camel@sipsolutions.net> Subject: Re: [RFC PATCH 9/9] debugfs: free debugfs_fsdata instances From: Johannes Berg To: paulmck@linux.vnet.ibm.com Cc: Nicolai Stange , Greg Kroah-Hartman , linux-kernel@vger.kernel.org Date: Tue, 18 Apr 2017 17:20:38 +0200 In-Reply-To: <20170418151700.GU3956@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> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.4-1 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 :) johannes