rcutorture: Add a scenario for Tiny SRCU

This commit adds an SRCU-t rcutorture scenario for the new Tiny SRCU
implementation, removing the need to pass the --bootargs parameter to
kvm.sh to run Tiny SRCU tests.  This commit also adds SRCU-t to the set
of scenarios that are run by default.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

tools/testing/selftests/rcutorture/configs/rcu/CFLIST

@@ -9,6 +9,8 @@ TREE08
 TREE09
 SRCU-N
 SRCU-P
+SRCU-t
+SRCU-u
 TINY01
 TINY02
 TASKS01

tools/testing/selftests/rcutorture/configs/rcu/SRCU-t

+CONFIG_SMP=n
+CONFIG_PREEMPT_NONE=y
+CONFIG_PREEMPT_VOLUNTARY=n
+CONFIG_PREEMPT=n
+#CHECK#CONFIG_TINY_SRCU=y
+CONFIG_RCU_TRACE=n
+CONFIG_DEBUG_LOCK_ALLOC=n
+CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
+CONFIG_DEBUG_ATOMIC_SLEEP=y
+#CHECK#CONFIG_PREEMPT_COUNT=y

tools/testing/selftests/rcutorture/configs/rcu/SRCU-t.boot

+rcutorture.torture_type=srcu

tools/testing/selftests/rcutorture/configs/rcu/SRCU-u

+CONFIG_SMP=n
+CONFIG_PREEMPT_NONE=y
+CONFIG_PREEMPT_VOLUNTARY=n
+CONFIG_PREEMPT=n
+#CHECK#CONFIG_TINY_SRCU=y
+CONFIG_RCU_TRACE=n
+CONFIG_DEBUG_LOCK_ALLOC=n
+CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
+CONFIG_PREEMPT_COUNT=n

tools/testing/selftests/rcutorture/configs/rcu/SRCU-u.boot

+rcutorture.torture_type=srcud