linux-kernel - Re: [PATCH v2 tip/core/rcu 02/18] lockdep: Make RCU suspicious-access splats use pr

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Date:   Mon, 23 Jan 2017 14:33:19 -0800
From:   Josh Triplett <josh@...htriplett.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
        fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH v2 tip/core/rcu 02/18] lockdep: Make RCU
 suspicious-access splats use pr_err

On Mon, Jan 23, 2017 at 11:30:16AM -0800, Paul E. McKenney wrote:
> On Sat, Jan 21, 2017 at 12:40:23PM -0800, Josh Triplett wrote:
> > On Tue, Jan 17, 2017 at 06:53:41PM -0800, Paul E. McKenney wrote:
> > > This commit switches RCU suspicious-access splats use pr_err()
> > > instead of the current INFO printk()s.  This change makes it easier
> > > to automatically classify splats.
> > > 
> > > Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> > > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > > ---
> > >  kernel/locking/lockdep.c | 12 ++++++------
> > >  1 file changed, 6 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
> > > index 7c38f8f3d97b..a74c0630172a 100644
> > > --- a/kernel/locking/lockdep.c
> > > +++ b/kernel/locking/lockdep.c
> > > @@ -4412,13 +4412,13 @@ void lockdep_rcu_suspicious(const char *file, const int line, const char *s)
> > >  #endif /* #ifdef CONFIG_PROVE_RCU_REPEATEDLY */
> > >  	/* Note: the following can be executed concurrently, so be careful. */
> > >  	printk("\n");
> > > -	printk("===============================\n");
> > > -	printk("[ INFO: suspicious RCU usage. ]\n");
> > > +	pr_err("===============================\n");
> > > +	pr_err("[  suspicious RCU usage.      ]\n");
> > 
> > While re-adding the square bracket makes it symmetric, this change still
> > seems odd, and unrelated to the switch to pr_err.  You could change it
> > to "ERR:" if you want, if "INFO:" feels inaccurate to you.
> 
> So this would be OK?
> 
> 	pr_err("[ ERR: suspicious RCU usage.  ]\n");
> 
> (Changed to this as a best guess, but please let me know.)

Yeah, that seems fine.  Sorry to nitpick this; it just otherwise seemed
entirely unrelated to the rest of the change.