linux-kernel - Re: [PATCH 1/2 v4] scsi: add __print

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Date:	Thu, 01 Apr 2010 22:50:03 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Kei Tokunaga <tokunaga.keiich@...fujitsu.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Tomohiro Kusumi <kusumi.tomohiro@...fujitsu.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Subject: Re: [PATCH 1/2 v4] scsi: add __print_hex() to ftrace

On Fri, 2010-04-02 at 10:40 +0800, Li Zefan wrote:
> >> +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);
> > 
> > I would not put the putc(p, 0) into a helper function. This terminates
> > the buffer, and strings added to the trace_seq will go after the '\0'.
> > 
> 
> This is exactly what ftrace_print_flags_seq() and ftrace_print_symbols_seq()
> do, and exactly what we want.
> 
> An example:
> 
> TP_printk("%s,%s", __print_flags(...), __print_flags(...));
> 
> We need 2 seperated strings, while trace_seq_terminate() will make it
> a single string.

You're right! But I still don't like it ;-)

I probably should have had that in the __print_flags() macro instead of
the function. Oh well. These are only helper functions for the
__print*() variants anyway.

OK, you can have my Acked-by: Steven Rostedt <rostedt@...dmis.org> for
this.

-- Steve


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