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

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Message-ID: <20090526060232.GA10669@infradead.org>
Date:	Tue, 26 May 2009 02:02:32 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Jens Axboe <jens.axboe@...cle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	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, May 26, 2009 at 12:04:28PM +0800, 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().

If you want to make it really generaly dealing with NULL string pointers
would be extremly helpful.  I ran into that limitation (and the length
one fixed here) when converting the XFS tracing over.

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