rcu: Add lockdep-RCU checks for simple self-deadlock
It is illegal to have a grace period within a same-flavor RCU read-side critical section, so this commit adds lockdep-RCU checks to splat when such abuse is encountered. This commit does not detect more elaborate RCU deadlock situations. These situations might be a job for lockdep enhancements. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -172,6 +172,12 @@ static void __synchronize_srcu(struct srcu_struct *sp, void (*sync_func)(void))
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{
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int idx;
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rcu_lockdep_assert(!lock_is_held(&sp->dep_map) &&
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!lock_is_held(&rcu_bh_lock_map) &&
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!lock_is_held(&rcu_lock_map) &&
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!lock_is_held(&rcu_sched_lock_map),
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"Illegal synchronize_srcu() in same-type SRCU (or RCU) read-side critical section");
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idx = sp->completed;
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mutex_lock(&sp->mutex);
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