linux-kernel - Re: [PATCH V2 -tip 3/4] Tracing/ftrace: Adapt mmiotrace to the new type of print

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Date:	Tue, 30 Sep 2008 18:13:45 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Steven Rostedt <rostedt@...dmis.org>, Pekka Paalanen <pq@....fi>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 -tip 3/4] Tracing/ftrace: Adapt mmiotrace to the new
 type of print_line

Ingo Molnar wrote:
> * Frédéric Weisbecker <fweisbec@...il.com> wrote:
> 
>> 2008/9/30 Steven Rostedt <rostedt@...dmis.org>:
>>> OK, I'll nuke the ring_buffer_lock :-/
>>>
>>> The trace_pipe calls that and then calls print_trace_line which will
>>> eventually lock the buffer again. This is a bug on my part. I'll fix that
>>> today.
>>>
>>> Thanks,
>> Strange, I can't see any case where print_trace_line could call the
>> ring_buffer_lock.
>> Hmm, I will see in your patch.
>>
>> Ingo, I just saw one damage from the merging, trace_empty() returns 
>> TRACE_TYPE_HANDLED. The type is wrong, it should return 1. It's not 
>> urgent since the value is the same. Should I send a patch for such a 
>> small error?
> 
> yes, please do. One too many patch is far better than one too few ;-)
> 
> 	Ingo
> 

:)

Here it is!

Subject: [PATCH -tip] Tracing/ftrace: correct return value of trace_empty

Correct the value's type of trace_empty function

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6a1c76b..da3789d 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1686,7 +1686,7 @@ static int trace_empty(struct trace_iterator *iter)
 		if (!ring_buffer_iter_empty(iter->buffer_iter[cpu]))
 			return 0;
 	}
-	return TRACE_TYPE_HANDLED;
+	return 1;
 }
 
 static enum print_line_t print_trace_line(struct trace_iterator *iter)


diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6a1c76b..da3789d 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1686,7 +1686,7 @@ static int trace_empty(struct trace_iterator *iter)
 		if (!ring_buffer_iter_empty(iter->buffer_iter[cpu]))
 			return 0;
 	}
-	return TRACE_TYPE_HANDLED;
+	return 1;
 }
 
 static enum print_line_t print_trace_line(struct trace_iterator *iter)
--
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