kthread: Add __kthread_should_park()

kthread_should_park() is used to check if the calling kthread ('current')
should park, but there is no function to check whether an arbitrary kthread
should be parked. The latter is required to plug a CPU hotplug race vs. a
parking ksoftirqd thread.

The new __kthread_should_park() receives a task_struct as parameter to
check if the corresponding kernel thread should be parked.

Call __kthread_should_park() from kthread_should_park() to avoid code
duplication.

Signed-off-by: Matthias Kaehlcke <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: "Paul E . McKenney" <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Douglas Anderson <[email protected]>
Cc: Stephen Boyd <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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