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authorPaul E. McKenney <paulmck@kernel.org>2022-08-01 17:33:24 -0700
committerPaul E. McKenney <paulmck@kernel.org>2022-08-31 05:08:07 -0700
commitd594231aa50a0f113cfb4749da5162e6a0c3fa73 (patch)
tree7fa42630a7199483c9aab1906754d4b6d42f7c75 /kernel/rcu/rcutorture.c
parented7d2f1abee48a90fae5fdf5c60d71803a5a1d10 (diff)
rcutorture: Verify RCU reader prevents full polling from completing
This commit adds a test to rcu_torture_writer() that verifies that a ->get_gp_state_full() and ->poll_gp_state_full() polled grace-period sequence does not claim that a grace period elapsed within the confines of the corresponding read-side critical section. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/rcutorture.c')
-rw-r--r--kernel/rcu/rcutorture.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index f2564c7633a8..050f4d0a987f 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1309,6 +1309,8 @@ rcu_torture_writer(void *arg)
atomic_inc(&rcu_torture_wcount[i]);
WRITE_ONCE(old_rp->rtort_pipe_count,
old_rp->rtort_pipe_count + 1);
+
+ // Make sure readers block polled grace periods.
if (cur_ops->get_gp_state && cur_ops->poll_gp_state) {
idx = cur_ops->readlock();
cookie = cur_ops->get_gp_state();
@@ -1325,9 +1327,20 @@ rcu_torture_writer(void *arg)
}
cur_ops->readunlock(idx);
}
- if (cur_ops->get_gp_completed_full && cur_ops->poll_gp_state_full) {
- cur_ops->get_gp_completed_full(&cookie_full);
- WARN_ON_ONCE(!cur_ops->poll_gp_state_full(&cookie_full));
+ if (cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full) {
+ idx = cur_ops->readlock();
+ cur_ops->get_gp_state_full(&cookie_full);
+ WARN_ONCE(cur_ops->poll_gp_state_full(&cookie_full),
+ "%s: Cookie check 5 failed %s(%d) online %*pbl\n",
+ __func__,
+ rcu_torture_writer_state_getname(),
+ rcu_torture_writer_state,
+ cpumask_pr_args(cpu_online_mask));
+ if (cur_ops->get_gp_completed_full) {
+ cur_ops->get_gp_completed_full(&cookie_full);
+ WARN_ON_ONCE(!cur_ops->poll_gp_state_full(&cookie_full));
+ }
+ cur_ops->readunlock(idx);
}
switch (synctype[torture_random(&rand) % nsynctypes]) {
case RTWS_DEF_FREE: