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rcutorture: Add an rcu_busted to test the test
This commit adds a deliberately buggy RCU implementation into rcutorture to allow easy checking that rcutorture correctly flags buggy RCU implementations. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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1 changed files with 43 additions and 1 deletions
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@ -371,6 +371,48 @@ static struct rcu_torture_ops rcu_bh_ops = {
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.name = "rcu_bh"
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};
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/*
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* Don't even think about trying any of these in real life!!!
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* The names includes "busted", and they really means it!
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* The only purpose of these functions is to provide a buggy RCU
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* implementation to make sure that rcutorture correctly emits
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* buggy-RCU error messages.
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*/
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static void rcu_busted_torture_deferred_free(struct rcu_torture *p)
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{
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/* This is a deliberate bug for testing purposes only! */
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rcu_torture_cb(&p->rtort_rcu);
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}
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static void synchronize_rcu_busted(void)
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{
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/* This is a deliberate bug for testing purposes only! */
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}
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static void
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call_rcu_busted(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
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{
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/* This is a deliberate bug for testing purposes only! */
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func(head);
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}
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static struct rcu_torture_ops rcu_busted_ops = {
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.init = rcu_sync_torture_init,
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.readlock = rcu_torture_read_lock,
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.read_delay = rcu_read_delay, /* just reuse rcu's version. */
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.readunlock = rcu_torture_read_unlock,
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.completed = rcu_no_completed,
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.deferred_free = rcu_busted_torture_deferred_free,
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.sync = synchronize_rcu_busted,
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.exp_sync = synchronize_rcu_busted,
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.call = call_rcu_busted,
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.cb_barrier = NULL,
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.fqs = NULL,
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.stats = NULL,
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.irq_capable = 1,
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.name = "rcu_busted"
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};
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/*
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* Definitions for srcu torture testing.
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*/
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@ -1371,7 +1413,7 @@ rcu_torture_init(void)
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int cpu;
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int firsterr = 0;
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static struct rcu_torture_ops *torture_ops[] = {
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&rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops,
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&rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &sched_ops,
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};
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torture_init_begin(torture_type, verbose, &rcutorture_runnable);
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