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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>
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1 changed files with 16 additions and 3 deletions
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@ -1309,6 +1309,8 @@ rcu_torture_writer(void *arg)
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atomic_inc(&rcu_torture_wcount[i]);
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WRITE_ONCE(old_rp->rtort_pipe_count,
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old_rp->rtort_pipe_count + 1);
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// Make sure readers block polled grace periods.
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if (cur_ops->get_gp_state && cur_ops->poll_gp_state) {
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idx = cur_ops->readlock();
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cookie = cur_ops->get_gp_state();
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@ -1325,9 +1327,20 @@ rcu_torture_writer(void *arg)
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}
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cur_ops->readunlock(idx);
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}
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if (cur_ops->get_gp_completed_full && cur_ops->poll_gp_state_full) {
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cur_ops->get_gp_completed_full(&cookie_full);
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WARN_ON_ONCE(!cur_ops->poll_gp_state_full(&cookie_full));
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if (cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full) {
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idx = cur_ops->readlock();
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cur_ops->get_gp_state_full(&cookie_full);
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WARN_ONCE(cur_ops->poll_gp_state_full(&cookie_full),
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"%s: Cookie check 5 failed %s(%d) online %*pbl\n",
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__func__,
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rcu_torture_writer_state_getname(),
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rcu_torture_writer_state,
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cpumask_pr_args(cpu_online_mask));
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if (cur_ops->get_gp_completed_full) {
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cur_ops->get_gp_completed_full(&cookie_full);
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WARN_ON_ONCE(!cur_ops->poll_gp_state_full(&cookie_full));
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}
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cur_ops->readunlock(idx);
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}
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switch (synctype[torture_random(&rand) % nsynctypes]) {
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case RTWS_DEF_FREE:
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