linux-kernel - Re: [PATCH 02/13] tracing: Extract calls to trace_define_common

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Date:	Tue, 08 Dec 2009 16:03:58 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Lai Jiangshan <laijs@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH 02/13] tracing: Extract calls to	trace_define_common_fields()

>>> --- a/kernel/trace/trace_kprobe.c
>>> +++ b/kernel/trace/trace_kprobe.c
>>> @@ -1113,10 +1113,6 @@ static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
>>>  	struct kprobe_trace_entry field;
>>>  	struct trace_probe *tp = (struct trace_probe *)event_call->data;
>>>  
>>> -	ret = trace_define_common_fields(event_call);
>>> -	if (!ret)
>>> -		return ret;
>>> -
>>>  	DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0);
>>>  	DEFINE_FIELD(int, nargs, FIELD_STRING_NARGS, 1);
>>>  	/* Set argument names as fields */
>>> @@ -1131,10 +1127,6 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
>>>  	struct kretprobe_trace_entry field;
>>>  	struct trace_probe *tp = (struct trace_probe *)event_call->data;
>>>  
>>> -	ret = trace_define_common_fields(event_call);
>>> -	if (!ret)
>>> -		return ret;
>>> -
>>>  	DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0);
>>>  	DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0);
>>>  	DEFINE_FIELD(int, nargs, FIELD_STRING_NARGS, 1);
>> "if (!ret)" is wrong. trace_define_common_fields() returns zero when success.
>> So "unsigned long, func", "unsigned long, ret_ip" ...etc are NOT "defined"
>> and filters can not be applied for trace_kprobe.
>>
>> Reviewed-by: Lai Jiangshan <laijs@...fujitsu.com>
>>
> 
> Oh right!
> 
> Ok, I'm queueing this one for the tracing fixes.
> Thanks!
> 

This patch has dependency on the previous patch..So can you queue
all other patches and send a pull request to Ingo? We're still
in the early merge window, so those patches should be fine for
.33.

And as this patch fixes a bug "acidentally", the changelog
needs a bit revision.

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