diff options
| -rw-r--r-- | kernel/rcu/rcutorture.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 8e6c023212cb..480bba142e3a 100644 --- 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(); |