linux-kernel - Re: [PATCH] kdb: use kstrto instead of simple

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Message-ID: <556B46F9.2060806@gmail.com>
Date:	Sun, 31 May 2015 19:38:01 +0200
From:	Filip Ayazi <filipayazi@...il.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kdb: use kstrto instead of simple_strto

On 05/31/2015 02:29 PM, Alexey Dobriyan wrote:
>> Replace obsolete simple_strto* calls with appropriate kstrto*
>> functions.
>>   static int kdb_kill(int argc, const char **argv)
>>   {
>>   	long sig, pid;
>> -	char *endp;
>>   	struct task_struct *p;
>>   	struct siginfo info;
>>
>>   	if (argc != 2)
>>   		return KDB_ARGCOUNT;
>>
>> -	sig = simple_strtol(argv[1], &endp, 0);
>> -	if (*endp)
>> +	if (kstrtol(argv[1], 0, &sig) != 0)
>>   		return KDB_BADINT;
>>   	if (sig >= 0) {
>>   		kdb_printf("Invalid signal parameter.<-signal>\n");
>>   <at>  <at>  -2453,8 +2435,7  <at>  <at>  static int kdb_kill(int argc, const char **argv)
>>   	}
>>   	sig = -sig;
>>
>> -	pid = simple_strtol(argv[2], &endp, 0);
>> -	if (*endp)
>> +	if (kstrtol(argv[2], 0, &pid) != 0)
>>   		return KDB_BADINT;
>>   	if (pid <= 0) {
>>   		kdb_printf("Process ID must be large than 0.\n");
> This patch does easy mistake, namely trivial switch from simple_strtoul() to kstrtoul().
>
> But you have to remember that there are NO simple_strtoint() or something like that,
> so real type of data is anchor not function name.
>
> In the code above data are "sig" and "pid" which are "int" or "unsigned int" at most.
> Later "sig" is negated, so "int sig" is OK.

Thank you for the feedback, I know there is no simple_strtoint and the patch
uses kstrtoint/uint where the variable is declared as int/unsigned int 
(not doing
so would cause compilation warnings).
> Pids are always unsigned logically so "unsigned int" is correct.
>
> Don't be afraid to switch type of variable to correct one. Most of
> the time "unsigned long foo" is wrong becase C-derived api didn't offer
> anything better.

pid and sig variables are declared as long, I didn't know why so I 
didn't change
that, I will change their types to uint and int as you said and resend 
the patch soon.
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