From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933198AbbDUT4N (ORCPT ); Tue, 21 Apr 2015 15:56:13 -0400 Received: from e37.co.us.ibm.com ([32.97.110.158]:33203 "EHLO e37.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932255AbbDUT4B (ORCPT ); Tue, 21 Apr 2015 15:56:01 -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 03/12] rcu: Directly drive RCU_USER_QS from Kconfig Date: Tue, 21 Apr 2015 12:55:44 -0700 Message-Id: <1429646153-20677-3-git-send-email-paulmck@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1429646153-20677-1-git-send-email-paulmck@linux.vnet.ibm.com> References: <20150421195529.GA17864@linux.vnet.ibm.com> <1429646153-20677-1-git-send-email-paulmck@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15042119-0025-0000-0000-00000A081B46 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Paul E. McKenney" Currently, Kconfig will ask the user whether RCU_USER_QS should be set. This is silly because Kconfig already has all the information that it needs to set this parameter. This commit therefore directly drives the value of RCU_USER_QS via NO_HZ_FULL's "select" statement. Reported-by: Ingo Molnar Signed-off-by: Paul E. McKenney Cc: Frederic Weisbecker --- init/Kconfig | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/init/Kconfig b/init/Kconfig index 353714745015..6d2cf6453be7 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -527,9 +527,7 @@ config CONTEXT_TRACKING bool config RCU_USER_QS - bool "Consider userspace as in RCU extended quiescent state" - depends on HAVE_CONTEXT_TRACKING && SMP - select CONTEXT_TRACKING + bool help This option sets hooks on kernel / userspace boundaries and puts RCU in extended quiescent state when the CPU runs in @@ -537,12 +535,6 @@ config RCU_USER_QS excluded from the global RCU state machine and thus doesn't try to keep the timer tick on for RCU. - Unless you want to hack and help the development of the full - dynticks mode, you shouldn't enable this option. It also - adds unnecessary overhead. - - If unsure say N - config CONTEXT_TRACKING_FORCE bool "Force context tracking" depends on CONTEXT_TRACKING -- 1.8.1.5