Support for irq chips on slow busses (i2c, spi) - V2

The support for irq chips on slow busses eg. i2c, spi has been
discussed to great length several times. Most of the details can be
found in this thread: http://lkml.org/lkml/2009/7/21/266

The following patch series is a round up of the various patch snippets
sent out during the discussion and the ideas we agreed on.

This is version 2 of the patch series. The main changes vs. V1
(http://lkml.org/lkml/2009/8/13/348)

 - patch 1/3: Provide a generic primary handler function which just
   	      returns IRQ_WAKE_THREAD as this is all what oneshot
   	      threaded handlers need to avoid useless copies of that
   	      all over the place.

 - patch 2/3: Reverted to the initial idea of conditional locking to
   	      allow drivers to be used for both slowbus and standard
   	      interrupts without any magic in the driver code

 - patch 3/3: To avoid different driver code for nested or separate
   	      thread handling a new function is provided which allows
   	      to mark the interrupt nested. request_threaded_irq()
   	      creates a separate thread only when the flag is not set.

Please have a thorough look and hopefully a test ride on your
favourite slowbus irq chip implementation so we can get this into .32

Thanks,

	tglx




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