Date: Sat, 5 Dec 2015 17:46:24 -0800
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Josh Triplett <josh@joshtriplett.org>
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, jiangshanlai@gmail.com,
        dipankar@in.ibm.com, akpm@linux-foundation.org,
        mathieu.desnoyers@efficios.com, tglx@linutronix.de,
        peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com,
        edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com,
        oleg@redhat.com, bobby.prani@gmail.com
Subject: Re: [PATCH tip/core/rcu 5/8] rcutorture: Print symbolic name for
 rcu_torture_writer_state
Message-ID: <20151206014624.GL28602@linux.vnet.ibm.com>
Reply-To: paulmck@linux.vnet.ibm.com
References: <20151205002331.GA27249@linux.vnet.ibm.com>
 <1449275032-28206-5-git-send-email-paulmck@linux.vnet.ibm.com>
 <20151205010221.GB27128@cloud>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20151205010221.GB27128@cloud>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 2461
Lines: 76

On Fri, Dec 04, 2015 at 05:02:21PM -0800, Josh Triplett wrote:
> On Fri, Dec 04, 2015 at 04:23:49PM -0800, Paul E. McKenney wrote:
> > Currently, rcu_torture_writer_state is printed as an integer, which slows
> > debugging.  This commit therefore prints a symbolic name in addition to
> > the integer.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> > ---
> >  kernel/rcu/rcutorture.c | 24 +++++++++++++++++++++++-
> >  1 file changed, 23 insertions(+), 1 deletion(-)
> > 
> > diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
> > index d89328e260df..adbb194e2b5d 100644
> > --- a/kernel/rcu/rcutorture.c
> > +++ b/kernel/rcu/rcutorture.c
> > @@ -162,6 +162,27 @@ static int rcu_torture_writer_state;
> >  #define RTWS_SYNC		7
> >  #define RTWS_STUTTER		8
> >  #define RTWS_STOPPING		9
> > +static char * const rcu_torture_writer_state_names[] = {
> 
> Shouldn't this use "static const char * const"?  Also, see below.

Can't hurt...

> > +	"RTWS_FIXED_DELAY",
> > +	"RTWS_DELAY",
> > +	"RTWS_REPLACE",
> > +	"RTWS_DEF_FREE",
> > +	"RTWS_EXP_SYNC",
> > +	"RTWS_COND_GET",
> > +	"RTWS_COND_SYNC",
> > +	"RTWS_SYNC",
> > +	"RTWS_STUTTER",
> > +	"RTWS_STOPPING",
> > +};
> > +
> > +char *rcu_torture_writer_state_getname(void)
> 
> This should return "const char *", I think.

Yes, especially once I had made the earlier change.  Also made this
function be static while I was at it.

							Thanx, Paul

> > +{
> > +	unsigned int i = READ_ONCE(rcu_torture_writer_state);
> > +
> > +	if (i >= ARRAY_SIZE(rcu_torture_writer_state_names))
> > +		return "???";
> > +	return rcu_torture_writer_state_names[i];
> > +}
> >  
> >  #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE)
> >  #define RCUTORTURE_RUNNABLE_INIT 1
> > @@ -1307,7 +1328,8 @@ rcu_torture_stats_print(void)
> >  
> >  		rcutorture_get_gp_data(cur_ops->ttype,
> >  				       &flags, &gpnum, &completed);
> > -		pr_alert("??? Writer stall state %d g%lu c%lu f%#x\n",
> > +		pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x\n",
> > +			 rcu_torture_writer_state_getname(),
> >  			 rcu_torture_writer_state,
> >  			 gpnum, completed, flags);
> >  		show_rcu_gp_kthreads();
> > -- 
> > 2.5.2
> > 
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/