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rcutorture: Verify long-running reader prevents full polling from completing
This commit adds full-state polling checks to accompany the old-style polling checks in the rcu_torture_one_read() function. If a polling cycle within an RCU reader completes, a WARN_ONCE() is triggered. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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1 changed files with 10 additions and 0 deletions
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@ -1770,6 +1770,7 @@ rcutorture_loop_extend(int *readstate, struct torture_random_state *trsp,
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static bool rcu_torture_one_read(struct torture_random_state *trsp, long myid)
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{
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unsigned long cookie;
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struct rcu_gp_oldstate cookie_full;
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int i;
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unsigned long started;
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unsigned long completed;
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@ -1787,6 +1788,8 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp, long myid)
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rcutorture_one_extend(&readstate, newstate, trsp, rtrsp++);
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if (cur_ops->get_gp_state && cur_ops->poll_gp_state)
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cookie = cur_ops->get_gp_state();
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if (cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full)
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cur_ops->get_gp_state_full(&cookie_full);
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started = cur_ops->get_gp_seq();
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ts = rcu_trace_clock_local();
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p = rcu_dereference_check(rcu_torture_current,
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@ -1827,6 +1830,13 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp, long myid)
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rcu_torture_writer_state_getname(),
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rcu_torture_writer_state,
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cookie, cur_ops->get_gp_state());
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if (cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full)
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WARN_ONCE(cur_ops->poll_gp_state_full(&cookie_full),
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"%s: Cookie check 6 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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rcutorture_one_extend(&readstate, 0, trsp, rtrsp);
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WARN_ON_ONCE(readstate);
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// This next splat is expected behavior if leakpointer, especially
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