linux-kernel - Re: Odd Kconfig output..

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Message-ID: <20090908220943.GJ6753@linux.vnet.ibm.com>
Date:	Tue, 8 Sep 2009 15:09:43 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Valdis.Kletnieks@...edu
Cc:	Roman Zippel <zippel@...ux-m68k.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: Odd Kconfig output..

On Sat, Sep 05, 2009 at 09:06:14AM -0400, Valdis.Kletnieks@...edu wrote:
> Saw this while doing  a 'make oldconfig' moving from -mmotm0827 to -mmotm0903:
> 
> RCU Implementation
> > 1. Tree-based hierarchical RCU (TREE_RCU)
>   2. Preemptable tree-based hierarchical RCU (TREE_PREEMPT_RCU) (NEW)
> choice[1-2]: ?
> 
> There is no help available for this kernel option.
> Prompt: RCU Implementation
>   Defined at init/Kconfig:329
>   Location:
>     -> General setup
>       -> RCU Subsystem
>   Selected by: m [=m]
> 
> Where did that 'Selected by:' come from? Or is that just an artifact of
> the way Kconfig implements 'choice'?

Many of the architectures use a "select" clause for RCU, usually
selecting CLASSIC_RCU.  Could that be the issue?

							Thanx, Paul
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