Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932245Ab2KEUe5 (ORCPT ); Mon, 5 Nov 2012 15:34:57 -0500 Received: from mail-ie0-f174.google.com ([209.85.223.174]:33143 "EHLO mail-ie0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753889Ab2KEUey (ORCPT ); Mon, 5 Nov 2012 15:34:54 -0500 Date: Mon, 5 Nov 2012 12:34:44 -0800 (PST) From: Hugh Dickins X-X-Sender: hugh@eggly.anvils To: Alan Cox cc: Sasha Levin , Daniel Vetter , Sasha Levin , Greg Kroah-Hartman , Jiri Slaby , linux-kernel@vger.kernel.org, Dave Jones , linux-fbdev@vger.kernel.org, florianSchandinat@gmx.de Subject: Re: tty, vt: lockdep warnings In-Reply-To: <20121105201507.79fe47d7@pyramind.ukuu.org.uk> Message-ID: References: <50899507.1040900@oracle.com> <20121026143754.50277bd8@pyramind.ukuu.org.uk> <20121105175937.26f31d2a@pyramind.ukuu.org.uk> <5097FEA9.2090603@oracle.com> <20121105201507.79fe47d7@pyramind.ukuu.org.uk> User-Agent: Alpine 2.00 (LNX 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1096 Lines: 27 On Mon, 5 Nov 2012, Alan Cox wrote: > > The fbdev potential for deadlock may be years old, but the warning > > (and consequent disabling of lockdep from that point on - making it > > useless to everybody else in need of it) is new, and comes from the > > commit below in linux-next. > > > > I revert it in my own testing: if there is no quick fix to the > > fbdev issue on the way, Daniel, please revert it from your tree. > > If you revert it you swap it for a different deadlock - and one that > happens more often I would expect. Not very useful. But a deadlock we have lived with for years. Without reverting, we're prevented from discovering all the new deadlocks we're adding. > > I'm hoping the framebuffer maintainer will bother to respond to this > because that's the only way it can be sorted out. That would be ideal - thanks. Hugh -- 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/