Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754523AbbELWd5 (ORCPT ); Tue, 12 May 2015 18:33:57 -0400 Received: from e31.co.us.ibm.com ([32.97.110.149]:48903 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933962AbbELWbH (ORCPT ); Tue, 12 May 2015 18:31:07 -0400 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com, "Paul E. McKenney" Subject: [PATCH tip/core/rcu 18/24] rcu: Create RCU_EXPERT Kconfig and hide booleans behind it Date: Tue, 12 May 2015 15:30:48 -0700 Message-Id: <1431469854-3826-18-git-send-email-paulmck@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1431469854-3826-1-git-send-email-paulmck@linux.vnet.ibm.com> References: <20150512223034.GA1396@linux.vnet.ibm.com> <1431469854-3826-1-git-send-email-paulmck@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15051222-8236-0000-0000-00000B6F0863 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2173 Lines: 66 From: "Paul E. McKenney" This commit creates an RCU_EXPERT Kconfig and hides the independent boolean RCU-related user-visible Kconfig parameters behind it, namely RCU_FAST_NO_HZ and RCU_BOOST. This prevents Kconfig from asking about these parameters unless the user really wants to be asked. Reported-by: Linus Torvalds Signed-off-by: Paul E. McKenney Reviewed-by: Pranith Kumar --- init/Kconfig | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/init/Kconfig b/init/Kconfig index 0ec82362cfc0..7eb4c7b3543c 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -501,6 +501,21 @@ config TINY_RCU endchoice +config RCU_EXPERT + bool "Make expert-level adjustments to RCU configuration" + default n + help + This option needs to be enabled if you wish to make + expert-level adjustments to RCU configuration. By default, + no such adjustments can be made, which has the often-beneficial + side-effect of preventing "make oldconfig" from asking you all + sorts of detailed questions about how you would like numerous + obscure RCU options to be set up. + + Say Y if you need to make expert-level adjustments to RCU. + + Say N if you are unsure. + config SRCU bool help @@ -613,7 +628,7 @@ config RCU_FANOUT_LEAF config RCU_FAST_NO_HZ bool "Accelerate last non-dyntick-idle CPU's grace periods" - depends on NO_HZ_COMMON && SMP + depends on NO_HZ_COMMON && SMP && RCU_EXPERT default n help This option permits CPUs to enter dynticks-idle state even if @@ -639,7 +654,7 @@ config TREE_RCU_TRACE config RCU_BOOST bool "Enable RCU priority boosting" - depends on RT_MUTEXES && PREEMPT_RCU + depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT default n help This option boosts the priority of preempted RCU readers that -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/