rcu: Remove rcu_user_hooks_switch
Because there are neither uses nor intended uses for the rcu_user_hooks_switch() function that was orginally intended for nohz use, this commit removes it. Signed-off-by: NYang Shi <yang.shi@linaro.org> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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