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

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Date:	Mon, 12 Oct 2009 23:28:26 +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 05:20:09PM -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?



>> +		ret = strict_strtoul(arg + 1, 10,&param);
>                                      ^^^^^^^ here too, arg + 3.

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