From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750998AbaAOGif (ORCPT ); Wed, 15 Jan 2014 01:38:35 -0500 Received: from mail-ea0-f178.google.com ([209.85.215.178]:59141 "EHLO mail-ea0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750722AbaAOGic (ORCPT ); Wed, 15 Jan 2014 01:38:32 -0500 Date: Wed, 15 Jan 2014 07:38:27 +0100 From: Ingo Molnar To: John Stultz Cc: hpa@zytor.com, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, peterz@infradead.org, sboyd@codeaurora.org, w@1wt.eu, khalasa@piap.pl, u.kleine-koenig@pengutronix.de, tglx@linutronix.de, linux-tip-commits@vger.kernel.org Subject: Re: [tip:core/urgent] sched_clock: Disable seqlock lockdep usage in sched_clock() Message-ID: <20140115063827.GA11941@gmail.com> References: <1388704274-5278-2-git-send-email-john.stultz@linaro.org> <52D58D7F.2030306@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <52D58D7F.2030306@linaro.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * John Stultz wrote: > On 01/12/2014 10:42 AM, tip-bot for John Stultz wrote: > > Commit-ID: 7a06c41cbec33c6dbe7eec575c61986122617408 > > Gitweb: http://git.kernel.org/tip/7a06c41cbec33c6dbe7eec575c61986122617408 > > Author: John Stultz > > AuthorDate: Thu, 2 Jan 2014 15:11:14 -0800 > > Committer: Ingo Molnar > > CommitDate: Sun, 12 Jan 2014 10:14:00 +0100 > > > > sched_clock: Disable seqlock lockdep usage in sched_clock() > > > > Unfortunately the seqlock lockdep enablement can't be used > > in sched_clock(), since the lockdep infrastructure eventually > > calls into sched_clock(), which causes a deadlock. > > > > Thus, this patch changes all generic sched_clock() usage > > to use the raw_* methods. > > > > Acked-by: Linus Torvalds > > Reviewed-by: Stephen Boyd > > Reported-by: Krzysztof Hałasa > > Signed-off-by: John Stultz > > Cc: Uwe Kleine-König > > Cc: Willy Tarreau > > Signed-off-by: Peter Zijlstra > > Link: http://lkml.kernel.org/r/1388704274-5278-2-git-send-email-john.stultz@linaro.org > > Signed-off-by: Ingo Molnar > > Hey Ingo, > Just wanted to follow up here, since I've still not seen this (and > the raw_ renaming patch) submitted to Linus. These address a lockup that > triggers on ARM systems if lockdep is enabled and it would be good to > get it in before 3.13 is out. It's in tip:core/urgent, i.e. lined up for v3.13, I plan to send it to Linus later today. Thanks, Ingo