linux-kernel - Re: [PATCH 3/5] tracing/events: add rcu locking around trace event prints

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Date:	Fri, 17 Apr 2009 08:20:51 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Theodore Tso <tytso@....edu>, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [PATCH 3/5] tracing/events: add rcu locking around trace event
 prints

Steven Rostedt wrote:
> Ted, is this patch still needed?
>
> I'm starting to have second thoughts on this patch because it may require 
> adding: #include <linux/rcupdate.h> in include/trace/ftrace.h. Jeremy has 
> been struggling with include hell with these files.
>
> Hmm, maybe this is not an issue because we undef CREATE_TRACE_POINTS 
> before calling this.
>
> Jeremy,
>
> Do you see a problem if we include linux/rcupdate.h in ftrace.h?
> Remember, CREATE_TRACE_POINTS is undefined here.
>   
Hm, I don't think that matters; I'm seeing the #include problems when 
generating asm-offsets.h, which doesn't have CREATE_TRACE_POINTS set.

Or are you saying that you only need to include linux/rcupdate.h when 
CREATE_TRACE_POINTS is set?

    J
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