linux-kernel - Re: [PATCH][GIT PULL][v2.6.35] tracing/events: Convert format output to seq

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Message-ID: <4C0860DE.5020609@cn.fujitsu.com>
Date:	Fri, 04 Jun 2010 10:11:42 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	rostedt@...dmis.org
CC:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Kei Tokunaga <tokunaga.keiich@...fujitsu.com>,
	James Bottomley <James.Bottomley@...e.de>,
	Tomohiro Kusumi <kusumi.tomohiro@...fujitsu.com>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Subject: Re: [PATCH][GIT PULL][v2.6.35] tracing/events: Convert format output
 to seq_file

> +static void *f_start(struct seq_file *m, loff_t *pos)
> +{
> +	loff_t l = 1;
> +	void *p;
> +
> +	/* Start by showing the header */
> +	if (!*pos) {
> +		(*pos)++;

We shoudn't increment *pos in start() handler. It's a common mistake when
using seqfile. 

What we need to do in start() is move the pointer to postion *pos.

> +		return (void *)FORMAT_HEADER;
>  	}
>  
> -	if (r)
> -		r = trace_seq_printf(s, "\nprint fmt: %s\n",
> -				call->print_fmt);
> +	p = (void *)FORMAT_HEADER;
> +	do {
> +		p = f_next(m, p, &l);
> +	} while (p && l < *pos);
>  
> -	if (!r) {
> -		/*
> -		 * ug!  The format output is bigger than a PAGE!!
> -		 */
> -		buf = "FORMAT TOO BIG\n";
> -		r = simple_read_from_buffer(ubuf, cnt, ppos,
> -					      buf, strlen(buf));
> -		goto out;
> +	return p;
> +}
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