From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756238Ab3HaTbF (ORCPT ); Sat, 31 Aug 2013 15:31:05 -0400 Received: from e31.co.us.ibm.com ([32.97.110.149]:34925 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752863Ab3HaTbD (ORCPT ); Sat, 31 Aug 2013 15:31:03 -0400 Date: Sat, 31 Aug 2013 12:30:21 -0700 From: "Paul E. McKenney" To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Andrew Morton , Peter Zijlstra , Frederic Weisbecker , Jiri Olsa Subject: Re: [RFC][PATCH 03/18 v2] ftrace: Set ftrace internal function tracing RCU safe Message-ID: <20130831193021.GJ3871@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20130831051117.884125230@goodmis.org> <20130831051700.928372852@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130831051700.928372852@goodmis.org> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13083119-8236-0000-0000-0000014F4401 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Aug 31, 2013 at 01:11:20AM -0400, Steven Rostedt wrote: > From: "Steven Rostedt (Red Hat)" > > Since none of the internal ftrace function tracing uses RCU in > their callbacks, it is OK to set the global_ops (the one that > they all use) to RCU safe. > > Cc: Jiri Olsa > Cc: Paul E. McKenney > Signed-off-by: Steven Rostedt Acked-by: Paul E. McKenney > --- > kernel/trace/ftrace.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c > index d61f431..a45deaa 100644 > --- a/kernel/trace/ftrace.c > +++ b/kernel/trace/ftrace.c > @@ -1146,7 +1146,9 @@ static struct ftrace_ops global_ops = { > .func = ftrace_stub, > .notrace_hash = EMPTY_HASH, > .filter_hash = EMPTY_HASH, > - .flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_INITIALIZED, > + .flags = FTRACE_OPS_FL_RECURSION_SAFE | > + FTRACE_OPS_FL_INITIALIZED | > + FTRACE_OPS_FL_RCU_SAFE, > INIT_REGEX_LOCK(global_ops) > }; > > -- > 1.7.10.4 > >