linux-kernel - Re: [PATCH 1/2] scsi: add __print

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Message-ID: <4B56ABB6.9080802@cn.fujitsu.com>
Date:	Wed, 20 Jan 2010 15:07:34 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Joe Perches <joe@...ches.com>
CC:	Kei Tokunaga <tokunaga.keiich@...fujitsu.com>,
	linux-scsi@...r.kernel.org,
	James Bottomley <James.Bottomley@...e.de>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Tomohiro Kusumi <kusumi.tomohiro@...fujitsu.com>
Subject: Re: [PATCH 1/2] scsi: add __print_hex() to ftrace

Joe Perches wrote:
> On Wed, 2010-01-20 at 15:43 +0900, Kei Tokunaga wrote:
>> diff -puN kernel/trace/trace_output.c~ftrace_print_hex kernel/trace/trace_output.c
>> --- linux-2.6.33-rc4-trace/kernel/trace/trace_output.c~ftrace_print_hex	2010-01-14 19:55:45.000000000 +0900
>> +++ linux-2.6.33-rc4-trace-kei/kernel/trace/trace_output.c	2010-01-14 20:02:49.000000000 +0900
>> @@ -355,6 +355,21 @@ ftrace_print_symbols_seq(struct trace_se
>>  }
>>  EXPORT_SYMBOL(ftrace_print_symbols_seq);
>>  
>> +const char *
>> +ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
>> +{
>> +	int i;
>> +	const char *ret = p->buffer + p->len;
>> +
>> +	for (i = 0; i < buf_len; i++)
>> +		trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
>> +
>> +	trace_seq_putc(p, 0);
> 
> hex_dump_to_buffer?
> 

hex_dump_to_buffer has some limitations. For example, you have to specify:

	@rowsize: number of bytes to print per line; must be 16 or 32

We can change hex_dump_to_buffer() to fit our needs, but let us do
that later.

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