linux-kernel - Re: [PATCH tip/core/rcu 5/5] rcu: Make rcutorture emit online failures if verbose

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Date:	Sun, 18 Aug 2013 21:05:49 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu
Subject: Re: [PATCH tip/core/rcu 5/5] rcu: Make rcutorture emit online
 failures if verbose

On Sat, Aug 17, 2013 at 07:59:05PM -0700, Josh Triplett wrote:
> On Sat, Aug 17, 2013 at 07:25:17PM -0700, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > 
> > Although rcutorture counts CPU-hotplug online failures, it does
> > not explicitly record which CPUs were having trouble coming online.
> > This commit therefore emits a console message when online failure occurs.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> One completely optional note below; with or without that change,
> Reviewed-by: Josh Triplett <josh@...htriplett.org>
> 
> >  kernel/rcutorture.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> > 
> > diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
> > index 7d42d13..15bec39 100644
> > --- a/kernel/rcutorture.c
> > +++ b/kernel/rcutorture.c
> > @@ -1437,7 +1437,13 @@ rcu_torture_onoff(void *arg)
> >  					 torture_type, cpu);
> >  			starttime = jiffies;
> >  			n_online_attempts++;
> > -			if (cpu_up(cpu) == 0) {
> > +			ret = cpu_up(cpu);
> > +			if (ret != 0) {
> 
> Or just "if (ret) {"

Makes sense, fixed!

							Thanx, Paul

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