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@@ -562,7 +562,9 @@ This section presents a "toy" RCU implementation that is based on
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familiar locking primitives. Its overhead makes it a non-starter for
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real-life use, as does its lack of scalability. It is also unsuitable
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for realtime use, since it allows scheduling latency to "bleed" from
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-one read-side critical section to another.
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+one read-side critical section to another. It also assumes recursive
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+reader-writer locks: If you try this with non-recursive locks, and
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+you allow nested rcu_read_lock() calls, you can deadlock.
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However, it is probably the easiest implementation to relate to, so is
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a good starting point.
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Paul E. McKenney