From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxx>
Currently, each of six different types of failure triggers a
single WARN_ON_ONCE(), and it is then necessary to stare at the
rcu_torture_stats(), Reader Pipe, and Reader Batch lines looking for
inappropriately non-zero values. This can be annoying and error-prone,
so this commit provides a separate WARN_ON_ONCE() for each of the
six error conditions and adds short comments to each to ease error
identification.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
---
kernel/rcu/rcutorture.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 7dcb2b8..a9e97c3 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1442,15 +1442,18 @@ rcu_torture_stats_print(void)
n_rcu_torture_barrier_error);
pr_alert("%s%s ", torture_type, TORTURE_FLAG);
- if (atomic_read(&n_rcu_torture_mberror) != 0 ||
- n_rcu_torture_barrier_error != 0 ||
- n_rcu_torture_boost_ktrerror != 0 ||
- n_rcu_torture_boost_rterror != 0 ||
- n_rcu_torture_boost_failure != 0 ||
+ if (atomic_read(&n_rcu_torture_mberror) ||
+ n_rcu_torture_barrier_error || n_rcu_torture_boost_ktrerror ||
+ n_rcu_torture_boost_rterror || n_rcu_torture_boost_failure ||
i > 1) {
pr_cont("%s", "!!! ");
atomic_inc(&n_rcu_torture_error);
- WARN_ON_ONCE(1);
+ WARN_ON_ONCE(atomic_read(&n_rcu_torture_mberror));
+ WARN_ON_ONCE(n_rcu_torture_barrier_error); // rcu_barrier()
+ WARN_ON_ONCE(n_rcu_torture_boost_ktrerror); // no boost kthread
+ WARN_ON_ONCE(n_rcu_torture_boost_rterror); // can't set RT prio
+ WARN_ON_ONCE(n_rcu_torture_boost_failure); // RCU boost failed
+ WARN_ON_ONCE(i > 1); // Too-short grace period
}
pr_cont("Reader Pipe: ");
for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++)
--
2.9.5
