kthread: Implement park/unpark facility
To avoid the full teardown/setup of per cpu kthreads in the case of cpu hot(un)plug, provide a facility which allows to put the kthread into a park position and unpark it when the cpu comes online again. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Reviewed-by: NNamhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Reviewed-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/20120716103948.236618824@linutronix.deSigned-off-by: NThomas Gleixner <tglx@linutronix.de>
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