Quotes of the week

This patch set contains fixes for a trainwreck involving RCU, the scheduler, and threaded interrupts. This trainwreck involved RCU failing to properly protect one of its bit fields, use of RCU by the scheduler from portions of irq_exit() where in_irq() returns false, uses of the scheduler by RCU colliding with uses of RCU by the scheduler, threaded interrupts exercising the problematic portions of irq_exit() more heavily, and so on.

That said, have fun and make sure that you have the fire extinguisher ready when you start using this!