From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752793AbcDZTH1 (ORCPT ); Tue, 26 Apr 2016 15:07:27 -0400 Received: from e18.ny.us.ibm.com ([129.33.205.208]:37151 "EHLO e18.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750843AbcDZTHZ (ORCPT ); Tue, 26 Apr 2016 15:07:25 -0400 X-IBM-Helo: d01dlp03.pok.ibm.com X-IBM-MailFrom: paulmck@linux.vnet.ibm.com X-IBM-RcptTo: linux-kernel@vger.kernel.org;linux-omap@vger.kernel.org Date: Tue, 26 Apr 2016 12:07:55 -0700 From: "Paul E. McKenney" To: Tony Lindgren Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, Russell King , Steven Rostedt , linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH arm 1/1] arm: Use _rcuidle tracepoint to allow use from idle Message-ID: <20160426190755.GK3715@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <1461617335-22372-1-git-send-email-paulmck@linux.vnet.ibm.com> <20160426150031.GP5995@atomide.com> <20160426175214.GJ3715@linux.vnet.ibm.com> <20160426182939.GO5995@atomide.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160426182939.GO5995@atomide.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16042619-0045-0000-0000-000004082480 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 26, 2016 at 11:29:39AM -0700, Tony Lindgren wrote: > * Paul E. McKenney [160426 10:53]: > > Does the following patch help? > > It just changes the output.. See below. Ah -- you need both patches. These are on -rcu at: 501889db6fee (arm: Use _rcuidle tracepoint to allow use from idle) 99cd56ad86d2 (rm: Use more _rcuidle tracepoints to allow use from idle) And -rcu may be found at: git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git Thanx, Paul > > It is quite possible that there are quite a few more of these. If this > > is the case, then one way to make the kernel list more of them on a > > given boot is to build with CONFIG_PROVE_RCU_REPEATEDLY=y. > > OK > > Regards, > > Tony > > 8< ------------------ > CPU: Testing write buffer coherency: ok > CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 > > > RCU used illegally from idle CPU! > rcu_scheduler_active = 1, debug_locks = 0 > RCU used illegally from extended quiescent state! > no locks held by swapper/1/0. > > stack backtrace: > CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.6.0-rc5-next-20160426+ #1113 > Hardware name: Generic OMAP4 (Flattened Device Tree) > [] (unwind_backtrace) from [] (show_stack+0x10/0x14) > [] (show_stack) from [] (dump_stack+0xb0/0xe4) > [] (dump_stack) from [] (pwrdm_set_next_pwrst+0x100/0x1d4) > [] (pwrdm_set_next_pwrst) from [] (omap4_enter_lowpower+0xc8/0x230) > [] (omap4_enter_lowpower) from [] (omap_enter_idle_coupled+0x6c/0x254) > [] (omap_enter_idle_coupled) from [] (cpuidle_enter_state+0x80/0x3d4) > [] (cpuidle_enter_state) from [] (cpuidle_enter_state_coupled+0x348/0x390) > [] (cpuidle_enter_state_coupled) from [] (cpu_startup_entry+0x198/0x3a0) > [] (cpu_startup_entry) from [<8010162c>] (0x8010162c) > hw-breakpoint: Failed to enable monitor mode on CPU 0. >