From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753330Ab3D0HuT (ORCPT ); Sat, 27 Apr 2013 03:50:19 -0400 Received: from mail-ee0-f51.google.com ([74.125.83.51]:60288 "EHLO mail-ee0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751677Ab3D0HuR (ORCPT ); Sat, 27 Apr 2013 03:50:17 -0400 Date: Sat, 27 Apr 2013 09:50:11 +0200 From: Ingo Molnar To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, "Paul E. McKenney" , Peter Zijlstra , Arnaldo Carvalho de Melo , Thomas Gleixner Subject: [GIT PULL] perf fix Message-ID: <20130427075011.GA16589@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 Linus, Please pull the latest perf-urgent-for-linus git tree from: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-for-linus HEAD: c79aa0d96548aee50570209eb2d45c8f4ac49230 events: Protect access via task_subsys_state_check() This fix adds missing RCU read protection. Thanks, Ingo ------------------> Paul E. McKenney (1): events: Protect access via task_subsys_state_check() kernel/events/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index 4d3124b..9fcb094 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -4596,6 +4596,7 @@ void perf_event_comm(struct task_struct *task) struct perf_event_context *ctx; int ctxn; + rcu_read_lock(); for_each_task_context_nr(ctxn) { ctx = task->perf_event_ctxp[ctxn]; if (!ctx) @@ -4603,6 +4604,7 @@ void perf_event_comm(struct task_struct *task) perf_event_enable_on_exec(ctx); } + rcu_read_unlock(); if (!atomic_read(&nr_comm_events)) return;