linux-kernel - Re: [PATCH v3 16/33] tracing: Generalize per-element hist trigger data

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Message-ID: <20171004133414.4840c351@gandalf.local.home>
Date:   Wed, 4 Oct 2017 13:34:14 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:     tglx@...utronix.de, mhiramat@...nel.org, namhyung@...nel.org,
        vedang.patel@...el.com, bigeasy@...utronix.de,
        joel.opensrc@...il.com, joelaf@...gle.com,
        mathieu.desnoyers@...icios.com, baohong.liu@...el.com,
        rajvi.jingar@...el.com, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org
Subject: Re: [PATCH v3 16/33] tracing: Generalize per-element hist trigger
 data

On Fri, 22 Sep 2017 14:59:56 -0500
Tom Zanussi <tom.zanussi@...ux.intel.com> wrote:

> @@ -1742,7 +1746,8 @@ static void hist_trigger_stacktrace_print(struct seq_file *m,
>  			seq_printf(m, "%s: [%llx] %-55s", field_name,
>  				   uval, str);
>  		} else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
> -			char *comm = elt->private_data;
> +			struct hist_elt_data *elt_data = elt->private_data;

Weren't we going to add a "if (WARN_ON_ONCE(!elt_data)) return;" here?

-- Steve

> +			char *comm = elt_data->comm;
>  
>  			uval = *(u64 *)(key + key_field->offset);
>  			seq_printf(m, "%s: %-16s[%10llu]", field_name,
> --