linux-kernel - Re: [PATCH v2 1/2] tracing/events: make _

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Date:	Tue, 26 May 2009 16:56:43 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Li Zefan <lizf@...fujitsu.com>
cc:	Ingo Molnar <mingo@...e.hu>, Jens Axboe <jens.axboe@...cle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Theodore Ts'o <tytso@....edu>,
	Steven Whitehouse <swhiteho@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] tracing/events: make __string() more general



On Tue, 26 May 2009, Li Zefan wrote:

> This changes __string(..., src) to __string(..., len), thus makes it more
> general, and then block TRACE_EVENT() can use it.
> 
> Also introduce __fetch_str(), which is used in TP_assign() and returns
> the address of the string, while __get_str() is used in TP_print().
> 
> [ Impact: TRACE_EVENT api change ]

What's the reason for the change?

Is it to handle NULL pointers? If so, lets change the ftrace.h to handle
it instead.

This is why I like the Impact line really be a "rational" line.
 "TRACE_EVENT api change" is meaningless to me.

-- Steve
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