Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754894AbbBHBDV (ORCPT ); Sat, 7 Feb 2015 20:03:21 -0500 Received: from mail.orcon.net.nz ([219.88.242.52]:53884 "EHLO mail.orcon.net.nz" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751517AbbBHBDR (ORCPT ); Sat, 7 Feb 2015 20:03:17 -0500 X-Greylist: delayed 751 seconds by postgrey-1.27 at vger.kernel.org; Sat, 07 Feb 2015 20:03:17 EST Date: Sun, 8 Feb 2015 13:47:29 +1300 From: Michael Cree To: Mathieu Desnoyers Cc: Greg KH , linux-alpha@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , Huang Ying , linux-kernel@vger.kernel.org, Paul McKenney , David Howells , Pranith Kumar , stable@vger.kernel.org Subject: Re: [PATCH] llist: Fix missing lockless_dereference() Message-ID: <20150208004729.GA10472@omega> Mail-Followup-To: Michael Cree , Mathieu Desnoyers , Greg KH , linux-alpha@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , Huang Ying , linux-kernel@vger.kernel.org, Paul McKenney , David Howells , Pranith Kumar , stable@vger.kernel.org References: <1423274934-10625-1-git-send-email-mathieu.desnoyers@efficios.com> <20150207221625.GB31119@kroah.com> <1117480383.90061.1423348244225.JavaMail.zimbra@efficios.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1117480383.90061.1423348244225.JavaMail.zimbra@efficios.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-Bayes-Prob: 0.0001 (Score 0: No Bayes scoring rules defined, tokens from: outbound) X-Spam-Score: -2.63 () [Hold at 3.00] FREEMAIL_FROM:0.001,FSL_HELO_NON_FQDN_1:0.001,HELO_NO_DOMAIN:0.001,RDNS_DYNAMIC:0.363,CC(NZ:-3) X-CanIt-Geo: ip=60.234.221.162; country=NZ; latitude=-41.0000; longitude=174.0000; http://maps.google.com/maps?q=-41.0000,174.0000&z=6 X-CanItPRO-Stream: base:outbound X-Canit-Stats-ID: 02NNALAgU - 4d0ba0979cd9 - 20150208 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1218 Lines: 28 On Sat, Feb 07, 2015 at 10:30:44PM +0000, Mathieu Desnoyers wrote: > > On Fri, Feb 06, 2015 at 09:08:21PM -0500, Mathieu Desnoyers wrote: > > > A lockless_dereference() appears to be missing in llist_del_first(). > > > It should only matter for Alpha in practice. What could one anticipate to be the symptoms of such a missing lockless_dereference()? The Alpha kernel is behaving pretty well provided one builds a machine specific kernel and UP. When running an SMP kernel some packages (most notably the java runtime, but there are a few others) occasionally lock up in a pthread call --- could be a problem in libc rather then the kernel. > > Meta-comment, do we really care about Alpha anymore? Is it still > > consered an "active" arch we support? There are a few of us still running recent kernels on Alpha. I am maintaining the unofficial Debian alpha port at debian-ports, and the Debian popcon shows about 10 installations of Debian Alpha. Cheers Michael. -- 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/