linux-kernel - Re: [PATCH 2/4] tracing: add ring_buffer_event

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Message-ID: <alpine.DEB.2.00.0903231452450.3578@gandalf.stny.rr.com>
Date:	Mon, 23 Mar 2009 14:54:21 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Tom Zanussi <tzanussi@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 2/4] tracing: add ring_buffer_event_discard() to ring
 buffer


On Sun, 22 Mar 2009, Frederic Weisbecker wrote:

> >  
> > -/* inline for ring buffer fast paths */

[...]

> >  static unsigned
> > -rb_event_length(struct ring_buffer_event *event)
> > +rb_event_data_length(struct ring_buffer_event *event)
> >  {
> >  	unsigned length;
> >  
> > +	if (event->len)
> > +		length = event->len * RB_ALIGNMENT;
> > +	else
> > +		length = event->array[0];
> > +	return length + RB_EVNT_HDR_SIZE;
> > +}
> > +
> > +/* inline for ring buffer fast paths */
> 
> 
> I don't see an inline here.

That was my comment. I use to have a bunch of inlines, but someone thought 
gcc could do better and took them all out. The comment needs to be 
removed.

-- Steve


> 
> 
> > +static unsigned
> > +rb_event_length(struct ring_buffer_event *event)
> > +{
> >  	switch (event->type) {
> >  	case RINGBUF_TYPE_PADDING:
> > -		/* undefined */
> > -		return -1;
> > +		if (rb_null_event(event))
> > +			/* undefined */
> > +			return -1;
> > +		return rb_event_data_length(event);
> >  
> >  	case RINGBUF_TYPE_TIME_EXTEND:
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