linux-kernel - Re: [PATCH] rcu: Have rcu torture test select trace

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Date:	Mon, 4 Feb 2013 08:59:32 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Subject: Re: [PATCH] rcu: Have rcu torture test select trace_clock

On Mon, Feb 04, 2013 at 10:52:21AM -0500, Steven Rostedt wrote:
> The rcu torture test uses trace_clock, and requires that it be built
> into the kernel. If it is not, then we get the following build error:
> 
> ERROR: "trace_clock_local" [kernel/rcutorture.ko] undefined!
> 
> Reported-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

This would work, but would unnecessarily force trace_clock_local()
to be defined when RCU tracing is disabled.  So, would the alternative
patch I posted work for you?

							Thanx, Paul

> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 4057127..b542477 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -942,6 +942,7 @@ config SPARSE_RCU_POINTER
>  config RCU_TORTURE_TEST
>  	tristate "torture tests for RCU"
>  	depends on DEBUG_KERNEL
> +	select TRACE_CLOCK
>  	default n
>  	help
>  	  This option provides a kernel module that runs torture tests
> 
> 
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