[PATCH 0/7] RFC: __smp_call_function_single improvements

[Christoph Hellwig]

This series is on top of the blk-mq series Jens just set out and changes
the generic IPI mechanism to be directly usable for block completions.

Besides always making __smp_call_function_single constantly available it
changes it to use a lockless list that avoids the overhead of disabling
irq and a lock every time it is called.
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