linux-kernel - [PATCH tip/core/rcu 01/12] rcu: Directly drive TASKS

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Date:	Tue, 21 Apr 2015 12:55:42 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 01/12] rcu: Directly drive TASKS_RCU from Kconfig

From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>

Currently, Kconfig will ask the user whether TASKS_RCU 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 TASKS_RCU via "select" statements.  Which means that
as subsystems require TASKS_RCU, those subsystems will need to add
"select" statements of their own.

Reported-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
---
 init/Kconfig      | 4 +---
 lib/Kconfig.debug | 1 +
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 9a0592516f48..353714745015 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -507,7 +507,7 @@ config SRCU
 	  sections.
 
 config TASKS_RCU
-	bool "Task_based RCU implementation using voluntary context switch"
+	bool
 	default n
 	select SRCU
 	help
@@ -515,8 +515,6 @@ config TASKS_RCU
 	  only voluntary context switch (not preemption!), idle, and
 	  user-mode execution as quiescent states.
 
-	  If unsure, say N.
-
 config RCU_STALL_COMMON
 	def_bool ( TREE_RCU || PREEMPT_RCU || RCU_TRACE )
 	help
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 285c2292c1ce..4e52ea4bcdcc 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1220,6 +1220,7 @@ config RCU_TORTURE_TEST
 	depends on DEBUG_KERNEL
 	select TORTURE_TEST
 	select SRCU
+	select TASKS_RCU
 	default n
 	help
 	  This option provides a kernel module that runs torture tests
-- 
1.8.1.5

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