linux-kernel - Re: [RFC][PATCH 15/18 v2] ftrace/rcu: Mark functions that are RCU unsafe

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Date:	Sat, 31 Aug 2013 13:54:09 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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 15/18 v2] ftrace/rcu: Mark functions that are RCU
 unsafe

On Sat, Aug 31, 2013 at 04:43:24PM -0400, Steven Rostedt wrote:
> On Sat, 2013-08-31 at 13:00 -0700, Paul E. McKenney wrote:
> > On Sat, Aug 31, 2013 at 01:11:32AM -0400, Steven Rostedt wrote:
> > > From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> > > 
> > > Some callbacks of the function tracer use rcu_read_lock(). This means that
> > > there's places that can not be traced because RCU is not tracking the CPU
> > > for various reasons (like NO_HZ_FULL and coming back from userspace).
> > > 
> > > Thes functions need to be marked so that callbacks that use RCU do not
> > > trace them.
> > > 
> > > Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> > 
> > Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > Please let me know if you would like me to take this one.  If I don't
> > hear otherwise, I will assume that you are pushing it.
> > 
> 
> These I rather take, as they are all dependent on the previous changes.

Good point, applies to the other one we discussed as well.

							Thanx, Paul

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