rcutorture: Add test_nmis module parameter

[linux-2.6-microblaze.git] / kernel / rcu / rcutorture.c

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 8e6c023..480bba1 100644 (file)
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -119,6 +119,7 @@ torture_param(int, stutter, 5, "Number of seconds to run/halt test");
 torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes.");
 torture_param(int, test_boost_duration, 4, "Duration of each boost test, seconds.");
 torture_param(int, test_boost_interval, 7, "Interval between boost tests, seconds.");
+torture_param(int, test_nmis, 0, "End-test NMI tests, 0 to disable.");
 torture_param(bool, test_no_idle_hz, true, "Test support for tickless idle CPUs");
 torture_param(int, verbose, 1, "Enable verbose debugging printk()s");
 
@@ -2358,7 +2359,8 @@ rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag)
                 "n_barrier_cbs=%d "
                 "onoff_interval=%d onoff_holdoff=%d "
                 "read_exit_delay=%d read_exit_burst=%d "
-                "nocbs_nthreads=%d nocbs_toggle=%d\n",
+                "nocbs_nthreads=%d nocbs_toggle=%d "
+                "test_nmis=%d\n",
                 torture_type, tag, nrealreaders, nfakewriters,
                 stat_interval, verbose, test_no_idle_hz, shuffle_interval,
                 stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter,
@@ -2369,7 +2371,8 @@ rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag)
                 n_barrier_cbs,
                 onoff_interval, onoff_holdoff,
                 read_exit_delay, read_exit_burst,
-                nocbs_nthreads, nocbs_toggle);
+                nocbs_nthreads, nocbs_toggle,
+                test_nmis);
 }
 
 static int rcutorture_booster_cleanup(unsigned int cpu)
@@ -3273,6 +3276,29 @@ static void rcu_torture_read_exit_cleanup(void)
        torture_stop_kthread(rcutorture_read_exit, read_exit_task);
 }
 
+static void rcutorture_test_nmis(int n)
+{
+#if IS_BUILTIN(CONFIG_RCU_TORTURE_TEST)
+       int cpu;
+       int dumpcpu;
+       int i;
+
+       for (i = 0; i < n; i++) {
+               preempt_disable();
+               cpu = smp_processor_id();
+               dumpcpu = cpu + 1;
+               if (dumpcpu >= nr_cpu_ids)
+                       dumpcpu = 0;
+               pr_alert("%s: CPU %d invoking dump_cpu_task(%d)\n", __func__, cpu, dumpcpu);
+               dump_cpu_task(dumpcpu);
+               preempt_enable();
+               schedule_timeout_uninterruptible(15 * HZ);
+       }
+#else // #if IS_BUILTIN(CONFIG_RCU_TORTURE_TEST)
+       WARN_ONCE(n, "Non-zero rcutorture.test_nmis=%d permitted only when rcutorture is built in.\n", test_nmis);
+#endif // #else // #if IS_BUILTIN(CONFIG_RCU_TORTURE_TEST)
+}
+
 static enum cpuhp_state rcutor_hp;
 
 static void
@@ -3297,6 +3323,8 @@ rcu_torture_cleanup(void)
                return;
        }
 
+       rcutorture_test_nmis(test_nmis);
+
        if (cur_ops->gp_kthread_dbg)
                cur_ops->gp_kthread_dbg();
        rcu_torture_read_exit_cleanup();