Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759832AbbLCLvu (ORCPT ); Thu, 3 Dec 2015 06:51:50 -0500 Received: from pandora.arm.linux.org.uk ([78.32.30.218]:50276 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751940AbbLCLvt (ORCPT ); Thu, 3 Dec 2015 06:51:49 -0500 Date: Thu, 3 Dec 2015 11:51:43 +0000 From: Russell King - ARM Linux To: Peter Rosin Cc: "'linux-arm-kernel@lists.infradead.org'" , "'linux-kernel@vger.kernel.org'" Subject: Re: Domain faults when CONFIG_CPU_SW_DOMAIN_PAN is enabled Message-ID: <20151203115143.GM8644@n2100.arm.linux.org.uk> References: <1267b061b66c4d1fa8af1955825bc97a@EMAIL.axentia.se> <20151203110041.GK8644@n2100.arm.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1319 Lines: 33 On Thu, Dec 03, 2015 at 11:38:20AM +0000, Peter Rosin wrote: > Russell King wrote: > > On Thu, Dec 03, 2015 at 08:33:13AM +0000, Peter Rosin wrote: > > > I wrote: > > > > If I enable CONFIG_CPU_SW_DOMAIN_PAN, I sometimes (but not always) get the > > > > following (or very similar) on boot. > > > > > > I should have said "if I don't disable", as the option is "default y". > > > > > > Also, if it survives on boot, below is an example of later trouble (after > > > 30+ minutes on this occasion). > > > > Please apply this patch so we (might) get a slightly better oops dump, > > and then try to reproduce. > > Sure thing, but it's still "DAC: 00000051"... Thanks, that confirms that something in the uaccess-with-memcpy code is clearing the DACR back to 0x51. This has come up several times before, and I really can't spot the problem in this code, so I've always said to disable the uaccess-with-memcpy code. Personally, I'd like to see the back of that code... -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/