linux-kernel - Re: [PATCH v2 19/40] tracing: Account for variables in named trigger compatibility

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Date:   Thu, 07 Sep 2017 12:00:27 -0500
From:   Tom Zanussi <tom.zanussi@...ux.intel.com>
To:     Steven Rostedt <rostedt@...dmis.org>
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,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH v2 19/40] tracing: Account for variables in named
 trigger compatibility

On Thu, 2017-09-07 at 12:40 -0400, Steven Rostedt wrote:
> On Tue,  5 Sep 2017 16:57:31 -0500
> Tom Zanussi <tom.zanussi@...ux.intel.com> wrote:
> 
> > @@ -1786,6 +1786,12 @@ static bool hist_trigger_match(struct event_trigger_data *data,
> >  			return false;
> >  		if (key_field->is_signed != key_field_test->is_signed)
> >  			return false;
> > +		if ((key_field->var.name && !key_field_test->var.name) ||
> > +		    (!key_field->var.name && key_field_test->var.name))
> > +			return false;
> 
> Short cut:
> 
> 		if (!!key_field->var.name != !!key_field_test->var.name)
> 			return false;
> 

Nice!

> > +		if ((key_field->var.name && key_field_test->var.name) &&
> 
> Only need to test if key_field->var.name, as the previous if statement
> would exit out if key_field_test->var.name is false.
> 

OK, will change, thanks.

Tom