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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>
This commit is contained in:
Paul E. McKenney 2022-08-01 17:33:24 -07:00
parent ed7d2f1abe
commit d594231aa5
1 changed files with 16 additions and 3 deletions
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19
kernel/rcu/rcutorture.c
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@ -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: