linux-kernel - [PATCH 3/3] rcu: Drive configuration directly from SMP and PREEMPT

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Date:	Sat, 19 Nov 2011 13:50:28 +0100
From:	John Kacur <jkacur@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	John Kacur <jkacur@...hat.com>
Subject: [PATCH 3/3] rcu: Drive configuration directly from SMP and PREEMPT

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

This commit eliminates the possibility of running TREE_PREEMPT_RCU
when SMP=n and of running TINY_RCU when PREEMPT=y.  People who really
want these combinations can hand-edit init/Kconfig, but eliminating
them as choices for production systems reduces the amount of testing
required.  It will also allow cutting out a few #ifdefs.

Note that running TREE_RCU and TINY_RCU on single-CPU systems using
SMP-built kernels is still supported.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

commit 8008e129dc90ff4f7a56cb033d6bd042afe3ed52 upstream
Cherry-picked for v3.0-rt and fixed-up merge conflicts
Note: This makes the depends lines for these options in init/Kconfig for v3.0-rt
match those for v3.2-rc2-rt3
Signed-off-by: John Kacur <jkacur@...hat.com>
---
 init/Kconfig |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 89e40a4..5c1147e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -391,7 +391,7 @@ config TREE_RCU
 
 config TREE_PREEMPT_RCU
 	bool "Preemptible tree-based hierarchical RCU"
-	depends on PREEMPT
+	depends on PREEMPT && SMP
 	help
 	  This option selects the RCU implementation that is
 	  designed for very large SMP systems with hundreds or
@@ -401,7 +401,7 @@ config TREE_PREEMPT_RCU
 
 config TINY_RCU
 	bool "UP-only small-memory-footprint RCU"
-	depends on !SMP && !PREEMPT_RT_FULL
+	depends on !PREEMPT && !SMP
 	help
 	  This option selects the RCU implementation that is
 	  designed for UP systems from which real-time response
@@ -410,7 +410,7 @@ config TINY_RCU
 
 config TINY_PREEMPT_RCU
 	bool "Preemptible UP-only small-memory-footprint RCU"
-	depends on !SMP && PREEMPT && !PREEMPT_RT_FULL
+	depends on PREEMPT && !SMP
 	help
 	  This option selects the RCU implementation that is designed
 	  for real-time UP systems.  This option greatly reduces the
-- 
1.7.2.3

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