linux-kernel - Re: [RFC PATCH tracing/kprobes 4/5] perf: Support perf kprobe command for kprobe-event setup helper

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Date:	Mon, 28 Sep 2009 12:51:48 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	systemtap <systemtap@...rceware.org>
Subject: Re: [RFC PATCH tracing/kprobes 4/5] perf: Support perf kprobe command
 for kprobe-event setup helper

Steven Rostedt wrote:
> On Fri, 2009-09-25 at 12:15 -0700, Masami Hiramatsu wrote:
> 
>> +
>> +#define MAX_CMDLEN 256
>> +
>> +static int synthesize_probepoint(struct probe_point *pp)
>> +{
>> +	char *buf;
>> +	int i, len, ret;
>> +	pp->probes[0] = buf = (char *)calloc(MAX_CMDLEN, sizeof(char));
>> +	len = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
> 
> What happens if func and offset is too big for MAX_CMDLEN?

Oops, it must be checked.

> 
>> +	for (i = 0; i<  pp->nr_args; i++) {
> 
> Can you have a case where pp->nr_args == 0?

Sure, I'll check that.

Thank you!

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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