rcu: Remove "cpu" argument to rcu_preempt_check_callbacks()
Because rcu_preempt_check_callbacks()'s argument is guaranteed to always be the current CPU, drop the argument and replace per_cpu() with __this_cpu_read(). Signed-off-by:Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by:
Pranith Kumar <bobby.prani@gmail.com>
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