linux-kernel - Re: [PATCH 1/2] rcu: Fix full dynticks' dependency on wide RCU nocb mode

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Message-ID: <CAFTL4hxcmoNV54NG2=xswgvjStYLdOBwi=FP7q_=s0vmp4uTrQ@mail.gmail.com>
Date:	Sat, 4 May 2013 08:37:38 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	paulmck@...ux.vnet.ibm.com, Ingo Molnar <mingo@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Kevin Hilman <khilman@...aro.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/2] rcu: Fix full dynticks' dependency on wide RCU nocb mode

2013/5/3 Paul E. McKenney <paulmck@...ux.vnet.ibm.com>:
> On Fri, May 03, 2013 at 06:47:55PM +0200, Frederic Weisbecker wrote:
>> Commit 0637e029392386e6996f5d6574aadccee8315efa
>> ("nohz: Select wide RCU nocb for full dynticks") intended
>> to force CONFIG_RCU_NOCB_CPU_ALL=y when full dynticks is
>> enabled.
>>
>> However this option is part of a choice menu and Kconfig's
>> "select" instruction has no effect on such targets.
>>
>> Fix this by using reverse dependencies on the targets we
>> don't want instead.
>>
>> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
>> Cc: Christoph Lameter <cl@...ux.com>
>> Cc: Hakan Akkan <hakanakkan@...il.com>
>> Cc: Ingo Molnar <mingo@...nel.org>
>> Cc: Kevin Hilman <khilman@...aro.org>
>> Cc: Li Zhong <zhong@...ux.vnet.ibm.com>
>> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
>> Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
>> Cc: Peter Zijlstra <peterz@...radead.org>
>> Cc: Steven Rostedt <rostedt@...dmis.org>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>
> Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Nice!

Ingo, if you haven't yet pulled, please rather pick the
"timers/nohz-hz1-v2" branch that has the Reviewed-by: tag from Paul.

Thanks.
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