linux-kernel - Re: [PATCH RT 3/5] tracing: Restore proper field flag printing when displaying triggers

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Date:   Wed, 16 May 2018 11:45:35 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Julia Cartwright <julia@...com>,
        Daniel Wagner <daniel.wagner@...mens.com>,
        tom.zanussi@...ux.intel.com
Subject: Re: [PATCH RT 3/5] tracing: Restore proper field flag printing when
 displaying triggers

On Wed, 16 May 2018 17:32:14 +0200
Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:

> On 2018-05-16 09:36:45 [-0400], Steven Rostedt wrote:
> > diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> > index 9dac8bae4f34..4745ed588607 100644
> > --- a/kernel/trace/trace_events_hist.c
> > +++ b/kernel/trace/trace_events_hist.c
> > @@ -4916,6 +4916,16 @@ static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
> >  		seq_printf(m, "%s", field_name);
> >  	} else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
> >  		seq_puts(m, "common_timestamp");
> > +
> > +	if (hist_field->flags) {
> > +		if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
> > +		    !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
> > +			const char *flags = get_hist_field_flags(hist_field);
> > +
> > +			if (flags)
> > +				seq_printf(m, ".%s", flags);
> > +		}
> > +	}
> >  }
> >  
> >  static int event_hist_trigger_print(struct seq_file *m,  
> 
> For v4.16 I needed commit 0ae7961e75c3 ("tracing: Fix display of hist
> trigger expressions containing timestamps") in order to get this one

Yes, I assumed you had it as you pulled it into 4.14-rt. I was just
looking at what 4.14-rt has. Anything you added there you should add to
4.16-rt as well.

> cleanly applied. Comparing with -rc3 it looks like commit 5e4cf2bf6d1c
> ("tracing: Fix a potential NULL dereference") would be great addition.

Good catch, yeah, I should pull that in too.

> 
> Safe to take them, right?

Yep.

-- Steve