From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754275Ab1JXJY5 (ORCPT ); Mon, 24 Oct 2011 05:24:57 -0400 Received: from www.linutronix.de ([62.245.132.108]:56479 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753961Ab1JXJY4 (ORCPT ); Mon, 24 Oct 2011 05:24:56 -0400 Date: Mon, 24 Oct 2011 11:24:51 +0200 (CEST) From: Thomas Gleixner To: Yong Zhang cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org Subject: Re: [RFC] [PATCH -rt 5/5] cpufreq: get rid of get_online_cpus()/put_online_cpus() In-Reply-To: <20111024024416.GB24581@zhy> Message-ID: References: <1318762607-2261-1-git-send-email-yong.zhang0@gmail.com> <1318762607-2261-6-git-send-email-yong.zhang0@gmail.com> <20111024024416.GB24581@zhy> User-Agent: Alpine 2.02 (LFD 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 24 Oct 2011, Yong Zhang wrote: > On Wed, Oct 19, 2011 at 11:12:20AM +0200, Thomas Gleixner wrote: > > On Sun, 16 Oct 2011, Yong Zhang wrote: > > > > > Fix below false positive (seems this is not a real deadlock scenario) > > > lockdep warning: > > > > This looks like you caused it with patch 1. > > Hmmm, yup. > CPU_DOWN_PREPARE will be under cpu_hotplug.lock. > > > Both need a bit more > > thought, but thanks for catching that. > > No sure whether it's big issue or not. > Mind showing more about your concern? This is probably not the only place which will run into that issue and I have not much interest to patch all those sites. Thanks, tglx