linux-kernel - Re: [PATCH tracing/kprobes v3 3/7] tracing/kprobes: Rename special variables

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Message-ID: <20091012213429.GF4748@nowhere>
Date:	Mon, 12 Oct 2009 23:34:30 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	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>
Subject: Re: [PATCH tracing/kprobes v3 3/7] tracing/kprobes: Rename special
	variables

On Mon, Oct 12, 2009 at 05:36:56PM -0400, Masami Hiramatsu wrote:
> Frederic Weisbecker wrote:
>> On Mon, Oct 12, 2009 at 05:20:09PM -0400, Masami Hiramatsu wrote:
>>> Masami Hiramatsu wrote:
>>>> @@ -427,28 +427,17 @@ static int parse_probe_vars(char *arg, struct fetch_func *ff, int is_return)
>>>>    	int ret = 0;
>>>>    	unsigned long param;
>>>>
>>>> -	switch (arg[0]) {
>>>> -	case 'a':	/* argument */
>>>> -		ret = strict_strtoul(arg + 1, 10,&param);
>>>> -		if (ret || param>   PARAM_MAX_ARGS)
>>>> -			ret = -EINVAL;
>>>> -		else {
>>>> -			ff->func = fetch_argument;
>>>> -			ff->data = (void *)param;
>>>> -		}
>>>> -		break;
>>>> -	case 'r':	/* retval or retaddr */
>>>> -		if (is_return&&   arg[1] == 'v') {
>>>> +	if (strcmp(arg, "retval") == 0) {
>>>> +		if (is_return) {
>>>>    			ff->func = fetch_retvalue;
>>>>    			ff->data = NULL;
>>>>    		} else
>>>>    			ret = -EINVAL;
>>>> -		break;
>>>> -	case 's':	/* stack */
>>>> -		if (arg[1] == 'a') {
>>>> +	} else if (strncmp(arg, "stack", 5) == 0) {
>>>> +		if (arg[5] == '\0') {
>>>>    			ff->func = fetch_stack_address;
>>>>    			ff->data = NULL;
>>>> -		} else {
>>>> +		} else if (isdigit(arg[5])) {
>>>>    			ret = strict_strtoul(arg + 1, 10,&param);
>>>                                               ^^^^^^^ this should be arg + 5.
>>>
>>>> @@ -456,11 +445,18 @@ static int parse_probe_vars(char *arg, struct fetch_func *ff, int is_return)
>>>>    				ff->func = fetch_stack;
>>>>    				ff->data = (void *)param;
>>>>    			}
>>>> +		} else
>>>> +			ret = -EINVAL;
>>>> +	} else if (strncmp(arg, "arg", 3) == 0&&   isdigit(arg[4])) {
>>
>>
>>
>> And this should be isdigit(arg[3]) actually, what you want to test is the
>> first character after arg, right?
>
> Right. I'll fix it...
>
>
> Thank you,


No need to, I've rebased and pushed to the same tree :-)

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