linux-kernel - Re: [PATCH v6] Unified trace buffer

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Message-ID: <20080926223129.GF15446@ghostprotocols.net>
Date:	Fri, 26 Sep 2008 19:31:29 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	prasad@...ux.vnet.ibm.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	David Wilder <dwilder@...ibm.com>, hch@....de,
	Martin Bligh <mbligh@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH v6] Unified trace buffer

Em Fri, Sep 26, 2008 at 02:05:44PM -0400, Steven Rostedt escreveu:
> + */
> +static inline void *
> +ring_buffer_event_data(struct ring_buffer_event *event)
> +{
> +	BUG_ON(event->type != RB_TYPE_DATA);
> +	/* If length is in len field, then array[0] has the data */
> +	if (event->len)
> +		return (void *)&event->array[0];
> +	/* Otherwise length is in array[0] and array[1] has the data */
> +	return (void *)&event->array[1];

Nitpick: Why cast to void *?

And sometimes you use the rb_ prefix, in other cases you use the longer
for ring_buffer_, is the ring_ namespace already used? Or can we make it
use rb_ consistently to shorten the names?

- Arnaldo
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