diff options
Diffstat (limited to 'kernel/rcu/rcutorture.c')
| -rw-r--r-- | kernel/rcu/rcutorture.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 80ff9a743d31..9efb8258a272 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -3604,12 +3604,46 @@ static void rcu_torture_init_srcu_lockdep(void) return; } +#ifdef CONFIG_TASKS_TRACE_RCU + if (testtype == 3) { + pr_info("%s: test_srcu_lockdep = %05d: SRCU and Tasks Trace RCU %d-way %sdeadlock.\n", + __func__, test_srcu_lockdep, cyclelen, deadlock ? "" : "non-"); + if (deadlock && cyclelen == 1) + pr_info("%s: Expect hang.\n", __func__); + for (i = 0; i < cyclelen; i++) { + char *fl = i == 0 ? "rcu_read_lock_trace" : "srcu_read_lock"; + char *fs = i == cyclelen - 1 ? "synchronize_rcu_tasks_trace" + : "synchronize_srcu"; + char *fu = i == 0 ? "rcu_read_unlock_trace" : "srcu_read_unlock"; + + j = srcu_lockdep_next(__func__, fl, fs, fu, i, cyclelen, deadlock); + if (i == 0) + rcu_read_lock_trace(); + else + idx = srcu_read_lock(srcus[i]); + if (j >= 0) { + if (i == cyclelen - 1) + synchronize_rcu_tasks_trace(); + else + synchronize_srcu(srcus[j]); + } + if (i == 0) + rcu_read_unlock_trace(); + else + srcu_read_unlock(srcus[i], idx); + } + return; + } +#endif // #ifdef CONFIG_TASKS_TRACE_RCU + err_out: pr_info("%s: test_srcu_lockdep = %05d does nothing.\n", __func__, test_srcu_lockdep); pr_info("%s: test_srcu_lockdep = DNNL.\n", __func__); pr_info("%s: D: Deadlock if nonzero.\n", __func__); - pr_info("%s: NN: Test number, 0=SRCU, 1=SRCU/mutex, 2=SRCU/rwsem.\n", __func__); + pr_info("%s: NN: Test number, 0=SRCU, 1=SRCU/mutex, 2=SRCU/rwsem, 3=SRCU/Tasks Trace RCU.\n", __func__); pr_info("%s: L: Cycle length.\n", __func__); + if (!IS_ENABLED(CONFIG_TASKS_TRACE_RCU)) + pr_info("%s: NN=3 disallowed because kernel is built with CONFIG_TASKS_TRACE_RCU=n\n", __func__); } static int __init |