linux-kernel - Re: [RFC][PATCH 03/18 v2] ftrace: Set ftrace internal function tracing RCU safe

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Date:	Tue, 3 Sep 2013 09:22:24 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [RFC][PATCH 03/18 v2] ftrace: Set ftrace internal function
 tracing RCU safe

On Sat, 31 Aug 2013 12:44:31 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> On Sat, Aug 31, 2013 at 01:11:20AM -0400, Steven Rostedt wrote:
> > From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> > 
> > 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 <jolsa@...hat.com>
> > Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> 
> Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

You must have liked this patch so much... that you acked it twice ;-)

-- Steve

> 
> > ---
> >  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
> > 
> > 

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