rcutorture: Add NOCB01 config for RCU_LAZY torture testing

Add new rcutorture config NOCB01 that enables CONFIG_RCU_LAZY combined
with CONFIG_RCU_NOCB_CPU to exercise the lazy callback code paths in
the NOCB implementation.

This config exercises lazy callback paths not covered by other configs,
including lazy-only wake and lazy defer logic.

This config is not added to CFLIST to avoid increasing the default
test duration; it can be run explicitly when lazy callback testing
is needed.

Acked-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>

diff --git a/tools/testing/selftests/rcutorture/configs/rcu/NOCB01 b/tools/testing/selftests/rcutorture/configs/rcu/NOCB01
new file mode 100644 (file)
index 0000000..bbe6d28
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/configs/rcu/NOCB01
@@ -0,0 +1,21 @@
+CONFIG_SMP=y
+CONFIG_NR_CPUS=8
+CONFIG_PREEMPT_NONE=n
+CONFIG_PREEMPT_VOLUNTARY=n
+CONFIG_PREEMPT=y
+#CHECK#CONFIG_PREEMPT_RCU=y
+CONFIG_HZ_PERIODIC=n
+CONFIG_NO_HZ_IDLE=y
+CONFIG_NO_HZ_FULL=n
+CONFIG_RCU_TRACE=y
+CONFIG_HOTPLUG_CPU=y
+CONFIG_RCU_FANOUT=3
+CONFIG_RCU_FANOUT_LEAF=2
+CONFIG_RCU_NOCB_CPU=y
+CONFIG_DEBUG_LOCK_ALLOC=n
+CONFIG_PROVE_LOCKING=n
+CONFIG_RCU_BOOST=n
+CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
+CONFIG_RCU_EXPERT=y
+CONFIG_RCU_EQS_DEBUG=y
+CONFIG_RCU_LAZY=y

diff --git a/tools/testing/selftests/rcutorture/configs/rcu/NOCB01.boot b/tools/testing/selftests/rcutorture/configs/rcu/NOCB01.boot
new file mode 100644 (file)
index 0000000..5130bc8
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/configs/rcu/NOCB01.boot
@@ -0,0 +1,2 @@
+rcupdate.rcu_self_test=1
+rcu_nocbs=all