rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers)

This patch allows torturing RCU from irq handlers (timers, in this case).
A new module parameter irqreader enables such additional torturing,
and is enabled by default.  Variants of RCU that do not tolerate readers
being called from irq handlers (e.g., SRCU) ignore irqreader.

Signed-off-by: Paul E. McKenney <[email protected]>
Cc: [email protected]
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Signed-off-by: Ingo Molnar <[email protected]>

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