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Date: Sun, 2 Mar 2008 04:09:03 +0100 (CET)
From: Roman Zippel <zippel@linux-m68k.org>
X-X-Sender: roman@scrub.home
To: Steven Rostedt <rostedt@goodmis.org>
cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, ego@in.ibm.com,
       linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
       Ingo Molnar <mingo@elte.hu>, Dipankar Sarma <dipankar@in.ibm.com>,
       Ted Tso <tytso@us.ibm.com>, dvhltc@us.ibm.com,
       Oleg Nesterov <oleg@tv-sign.ru>,
       Andrew Morton <akpm@linux-foundation.org>, bunk@kernel.org,
       Josh Triplett <josh@freedesktop.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [RFC PATCH 4/6] Preempt-RCU: Implementation
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Hi,

On Sat, 1 Mar 2008, Steven Rostedt wrote:

> >  config CLASSIC_RCU
> > -	bool "Classic RCU"
> > +	def_bool !PREEMPT_RCU
> >  	help
> >  	  This option selects the classic RCU implementation that is
> >  	  designed for best read-side performance on non-realtime
> > -	  systems.
> 
> Actually Paul, you don't need to make this an "option". Simply the default
> if PREEMPT_RCU is not selected. In otherwords, no prompt.
> 
> 	config CLASSIC_RCU
> 	  bool
> 	  depends on !PREEMPT_RCU
> 	  default y

There is no prompt. :)
"def_bool !PREEMPT_RCU" does the same as this.

bye, Roman