From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755565Ab0CDBuL (ORCPT ); Wed, 3 Mar 2010 20:50:11 -0500 Received: from e6.ny.us.ibm.com ([32.97.182.146]:46966 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755320Ab0CDBuE (ORCPT ); Wed, 3 Mar 2010 20:50:04 -0500 Date: Wed, 3 Mar 2010 17:50:01 -0800 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca, josh@joshtriplett.org, dvhltc@us.ibm.com, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com Subject: [PATCH tip/core/rcu 0/3] rcu: fix !PREEMPT, __mpol_dup(), and ftrace_perf_buf_prepare() RCU lockdep splats Message-ID: <20100304015001.GA32190@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.15+20070412 (2007-04-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This patch fixes three RCU lockdep issues: 1. Makes rcu_read_lock_sched_held() correctly handle !PREEMPT kernels. 2. Suppresses __mpol_dup() false positive. 3. Converts a pair of rcu_dereference() calls in ftrace_perf_buf_prepare() to rcu_dereference_sched(). There are probably more where these came from. ;-) Thanx, Paul ------------------------------------------------------------------------ include/linux/rcupdate.h | 15 ++++++++++++++- include/trace/ftrace.h | 4 ++-- kernel/trace/trace_event_profile.c | 5 ++--- mm/mempolicy.c | 3 ++- 4 files changed, 20 insertions(+), 7 deletions(-)