rcu: restrict TREE_RCU to SMP builds with !PREEMPT
Because both TINY_RCU and TREE_PREEMPT_RCU have been in mainline for several releases, it is time to restrict the use of TREE_RCU to SMP non-preemptible systems. This reduces testing/validation effort. This commit is a first step towards driving the selection of RCU implementation directly off of the SMP and PREEMPT configuration parameters. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -340,6 +340,7 @@ choice
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config TREE_RCU
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bool "Tree-based hierarchical RCU"
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depends on !PREEMPT && SMP
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help
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This option selects the RCU implementation that is
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designed for very large SMP system with hundreds or
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