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

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Message-ID: <20180516153213.mh5zgxzd2hwnkvuh@linutronix.de>
Date:   Wed, 16 May 2018 17:32:14 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
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 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
cleanly applied. Comparing with -rc3 it looks like commit 5e4cf2bf6d1c
("tracing: Fix a potential NULL dereference") would be great addition.

Safe to take them, right?

Sebastian