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

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Message-ID: <4A1C9AC4.3090704@cn.fujitsu.com>
Date:	Wed, 27 May 2009 09:43:32 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Christoph Hellwig <hch@...radead.org>
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>,
	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

Christoph Hellwig wrote:
> 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.
> 

I'm not suffering from NULL str, so I'm not quite sure how you want __string()
deal with it.


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