linux-kernel - Re: [PATCH] trace: don't print an extra separator of flags

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Date:	Mon, 20 Feb 2012 23:39:04 +0400
From:	"avagin@...il.com" <avagin@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Andrew Vagin <avagin@...nvz.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] trace: don't print an extra separator of flags

On 02/20/2012 10:09 PM, Steven Rostedt wrote:
> On Sun, 2012-02-19 at 14:16 +0300, Andrew Vagin wrote:
>> From: Andrey Vagin<avagin@...nvz.org>
>>
>> It occurs if __print_flags is used more than once
>
> Hi, which tracepoint does this? I like to see what the issue is.

The mainstream kernel doesn't have such trace-point, but I have.

Do you want to say that this bug should not be fixed in this case? :)

>
> Thanks,
>
> -- Steve
>
>>
>> Signed-off-by: Andrew Vagin<avagin@...nvz.org>
>> ---
>>   kernel/trace/trace_output.c |    6 ++++--
>>   1 files changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
>> index 0d6ff35..3efd718 100644
>> --- a/kernel/trace/trace_output.c
>> +++ b/kernel/trace/trace_output.c
>> @@ -300,7 +300,7 @@ ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
>>   	unsigned long mask;
>>   	const char *str;
>>   	const char *ret = p->buffer + p->len;
>> -	int i;
>> +	int i, first = 1;
>>
>>   	for (i = 0;  flag_array[i].name&&  flags; i++) {
>>
>> @@ -310,8 +310,10 @@ ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
>>
>>   		str = flag_array[i].name;
>>   		flags&= ~mask;
>> -		if (p->len&&  delim)
>> +		if (!first&&  delim)
>>   			trace_seq_puts(p, delim);
>> +		else
>> +			first = 0;
>>   		trace_seq_puts(p, str);
>>   	}
>>
>
>
> --
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