Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755934AbaKEPf4 (ORCPT ); Wed, 5 Nov 2014 10:35:56 -0500 Received: from mail-lb0-f174.google.com ([209.85.217.174]:39410 "EHLO mail-lb0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755454AbaKEPfx (ORCPT ); Wed, 5 Nov 2014 10:35:53 -0500 MIME-Version: 1.0 In-Reply-To: <20141105100056.152fd532@gandalf.local.home> References: <20141031170326.1491a63f@gandalf.local.home> <1414913427.5380.110.camel@marge.simpson.net> <20141105092707.7c9bb1ae@gandalf.local.home> <20141105100056.152fd532@gandalf.local.home> Date: Wed, 5 Nov 2014 15:35:51 +0000 Message-ID: Subject: Re: [ANNOUNCE] 3.14.23-rt20 From: Harry van Haaren To: Steven Rostedt Cc: Juerg Haefliger , Mike Galbraith , LKML , linux-rt-users , Thomas Gleixner , Carsten Emde , John Kacur , Sebastian Andrzej Siewior , Clark Williams Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 5 Nov 2014 14:50:41 +0100 Juerg Haefliger wrote: > The cpufreq code does nested down_read_trylocks and only the first one succeeds: >drivers/cpufreq/cpufreq.c: >store > down_read_trylock(cpufreq_rwsem) <- succeeds > store_scaling_governor > cpufreq_get_policy > cpufreq_cpu_get > down_read_trylock(cpufreq_rwsem) <-- fails On a related note: I think this patch/issue may be the cause of the -rt CPU frequency scaling bug I reported a couple of months ago. http://comments.gmane.org/gmane.linux.rt.user/12472 I'm currently using the performance governor by default as a workaround; thanks to JackWinter for packaging in the ArchAudio repos. Cheers, -Harry -- http://www.openavproductions.com -- 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/