EXP rcu: Revert expedited GP parallelization cleverness

This commit reverts a series of commits starting with fcc635436501 ("rcu:
Make expedited GPs handle CPU 0 being offline") and its successors, thus
queueing each rcu_node structure's expedited grace-period initialization
work on the first CPU of that rcu_node structure.

Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
1 file changed