calling kthread_create() from interrupt thread

[Dean Nelson]

I'm working on a driver that needs to create threads that can sleep/block
for an indefinite period of time.

    . Can kthread_create() be called from an interrupt handler?

    . Is the cost of a kthread's creation/demise low enough so that one
      can, as often as needed, create a kthread that performs a simple
      function and exits?  Or is the cost too high for this?

Thanks,
Dean
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