tree bef31f915ba940a66a3204fed2a6c9435262cf94
parent 537f16a641d21f756a8658b888529cb5d461db8c
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1425484384 -0800
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1425490791 -0800

rcu: Create an immutable rcu_data_p pointer to default rcu_data structure

This commit creates an immutable rcu_data_p pointer that references
rcu_preempt_data for TREE_PREEMPT_RCU builds and that references
rcu_sched_data for TREE_RCU builds.  This rcu_data_p pointer will enable
more code to move from #ifdef to IS_ENABLED().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>