linux-kernel - Re: [PATCH 0/3][RFC] tracing/rcu: Add _rcuidle() tracepoint to handle rcu_idle

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Date:	Wed, 15 Feb 2012 14:16:19 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Witold Baryluk <baryluk@....if.uj.edu.pl>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rob Herring <robherring2@...il.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Kevin Hilman <khilman@...com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/3][RFC] tracing/rcu: Add _rcuidle() tracepoint to
 handle rcu_idle_exit() tracepoints

On Tue, 2012-02-14 at 19:09 +0100, Witold Baryluk wrote:
> Hi,
> 
> I have some problem with cpuidle tracing:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=42742
> 
> so I applied 3 patches from https://lkml.org/lkml/headers/2012/2/7/231
> 
> > Steven Rostedt (3):
> >      tracing/rcu: Add trace_##name##__rcuidle() static tracepoint for inside rcu_idle_exit() sections
> >      x86/tracing: Denote the power and cpuidle tracepoints as _rcuidle()
> >      cpuidle/tracing: Denote the tracepoints as being in rcu_idle_exit() section
> 
> All 3 patches applied cleanly but for unknown reasons to me compilation fails:

Yeah, my testing hit this issue and I fixed it up. I pushed out my
patches to Ingo that have passed all my tests. You can get them here:

https://lkml.org/lkml/2012/2/13/528

You only need to apply patches 3,4 and 5.

-- Steve

> 
> CC      arch/x86/kernel/process.o
>   arch/x86/kernel/process.c: In function ‘default_idle’:
>   arch/x86/kernel/process.c:380:3: error: implicit declaration of function ‘trace_power_start_rcuidle’ [-Werror=implicit-function-declaration]
>   arch/x86/kernel/process.c:394:3: error: implicit declaration of function ‘trace_power_end_rcuidle’ [-Werror=implicit-function-declaration]
>   cc1: some warnings being treated as errors
> 


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