linux-kernel - Re: [PATCH 1/5] ftrace: remove redundant strsep in mod

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Message-ID: <CAJwJo6Ym4p9+HHouHCp_vExcK=ATFCreJBSgtfenQTDOUaGzzg@mail.gmail.com>
Date:	Mon, 5 Oct 2015 18:16:29 +0300
From:	Дмитрий Сафонов 
	<0x7f454c46@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	mingo@...hat.com, Jonathan Corbet <corbet@....net>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] ftrace: remove redundant strsep in mod_callback

Hello again, Steven.
I'm pinging :)

2015-09-29 22:11 GMT+03:00 Steven Rostedt <rostedt@...dmis.org>:
> On Tue, 29 Sep 2015 19:46:12 +0300
> Dmitry Safonov <0x7f454c46@...il.com> wrote:
>
>> By now there isn't any subcommand for mod.
>>
>> Before:
>>       sh$ echo '*:mod:ipv6:a' > set_ftrace_filter
>>       sh$ echo '*:mod:ipv6' > set_ftrace_filter
>> had the same results, but now first will result in:
>>       sh$ echo '*:mod:ipv6:a' > set_ftrace_filter
>>       -bash: echo: write error: Invalid argument
>>
>> Also, I clarified ftrace_mod_callback code a little.
>
> Thanks for the patches. I don't have time to look at them at the moment
> as I'm trying to finish up some stuff before I leave for LinuxCon EU.
>
> If you don't hear from me by Monday, feel free to ping me again. I'll
> be in Dublin (for LinuxCon), but I should be able to take a look at the
> patches while I'm there. What do you think keynotes are for ;-)
>
> -- Steve
>
>>
>> Signed-off-by: Dmitry Safonov <0x7f454c46@...il.com>
>> ---
>>  kernel/trace/ftrace.c | 17 ++++++-----------
>>  1 file changed, 6 insertions(+), 11 deletions(-)
>>
>> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
>> index b0623ac..f87401b 100644
>> --- a/kernel/trace/ftrace.c
>> +++ b/kernel/trace/ftrace.c
>> @@ -3564,8 +3564,7 @@ static int
>>  ftrace_mod_callback(struct ftrace_hash *hash,
>>                   char *func, char *cmd, char *param, int enable)
>>  {
>> -     char *mod;
>> -     int ret = -EINVAL;
>> +     int ret;
>>
>>       /*
>>        * cmd == 'mod' because we only registered this func
>> @@ -3576,16 +3575,12 @@ ftrace_mod_callback(struct ftrace_hash *hash,
>>        */
>>
>>       /* we must have a module name */
>> -     if (!param)
>> -             return ret;
>> -
>> -     mod = strsep(&param, ":");
>> -     if (!strlen(mod))
>> -             return ret;
>> +     if (!param || !strlen(param))
>> +             return -EINVAL;
>>
>> -     ret = ftrace_match_module_records(hash, func, mod);
>> -     if (!ret)
>> -             ret = -EINVAL;
>> +     ret = ftrace_match_module_records(hash, func, param);
>> +     if (ret == 0)
>> +             return -EINVAL;
>>       if (ret < 0)
>>               return ret;
>>
>
--
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