rcutorture: Add a test for synchronize_rcu_mult()

This commit adds a crude test for synchronize_rcu_mult().  This is
currently a smoke test rather than a high-quality stress test.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index b348cf8..fbb3e62 100644 (file)
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -20,7 +20,7 @@
 #include <linux/err.h>
 #include <linux/spinlock.h>
 #include <linux/smp.h>
-#include <linux/rcupdate.h>
+#include <linux/rcupdate_wait.h>
 #include <linux/interrupt.h>
 #include <linux/sched/signal.h>
 #include <uapi/linux/sched/types.h>
@@ -665,6 +665,11 @@ static void rcu_tasks_torture_deferred_free(struct rcu_torture *p)
        call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb);
 }
 
+static void synchronize_rcu_mult_test(void)
+{
+       synchronize_rcu_mult(call_rcu_tasks, call_rcu);
+}
+
 static struct rcu_torture_ops tasks_ops = {
        .ttype          = RCU_TASKS_FLAVOR,
        .init           = rcu_sync_torture_init,
@@ -674,7 +679,7 @@ static struct rcu_torture_ops tasks_ops = {
        .get_gp_seq     = rcu_no_completed,
        .deferred_free  = rcu_tasks_torture_deferred_free,
        .sync           = synchronize_rcu_tasks,
-       .exp_sync       = synchronize_rcu_tasks,
+       .exp_sync       = synchronize_rcu_mult_test,
        .call           = call_rcu_tasks,
        .cb_barrier     = rcu_barrier_tasks,
        .fqs            = NULL,