[PATCH tip/core/rcu 02/88] rcutorture: Add three-level tree test for Tree SRCU

From: Paul E. McKenney
Date: Thu May 25 2017 - 18:13:34 EST


This commit adds a test for a three-level srcu_node tree for Tree SRCU
in the existing SRCU-P scenario. This requires enabling CONFIG_RCU_EXPERT,
so the CONFIG_RCU_EXPERT=n scenario is now SRCU-N. The reason for using
SRCU-P for the tall tree is that preemption raises the possibility of
locating more bugs than does the non-preemptive SRCU-N.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/rcutorture/configs/rcu/SRCU-N | 2 +-
tools/testing/selftests/rcutorture/configs/rcu/SRCU-P | 4 +++-
2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N
index 1a087c3c8bb8..2da8b49589a0 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N
+++ b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N
@@ -5,4 +5,4 @@ CONFIG_HOTPLUG_CPU=y
CONFIG_PREEMPT_NONE=y
CONFIG_PREEMPT_VOLUNTARY=n
CONFIG_PREEMPT=n
-CONFIG_RCU_EXPERT=y
+#CHECK#CONFIG_RCU_EXPERT=n
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/SRCU-P b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-P
index 8205b481d9ed..ab7ccd38232b 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/SRCU-P
+++ b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-P
@@ -2,9 +2,11 @@ CONFIG_RCU_TRACE=n
CONFIG_SMP=y
CONFIG_NR_CPUS=8
CONFIG_HOTPLUG_CPU=y
+CONFIG_RCU_EXPERT=y
+CONFIG_RCU_FANOUT=2
+CONFIG_RCU_FANOUT_LEAF=2
CONFIG_PREEMPT_NONE=n
CONFIG_PREEMPT_VOLUNTARY=n
CONFIG_PREEMPT=y
-#CHECK#CONFIG_RCU_EXPERT=n
CONFIG_DEBUG_LOCK_ALLOC=y
CONFIG_PROVE_LOCKING=y
--
2.5.2