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charset="utf-8" PREEMPT_LAZY can be enabled stand-alone or alongside PREEMPT_DYNAMIC which allows for dynamic switching of preemption models. The choice of preemptible RCU or not, however, is fixed at compile time. Given the trade-offs made to have a preemptible RCU, some configurations which have limited preemption might prefer the stronger forward-progress guarantees of PREEMPT_RCU=3Dn. Accordingly, explicitly limit PREEMPT_RCU=3Dy to PREEMPT_DYNAMIC, PREEMPT, PREEMPT_RT. This means that (PREEMPT_LAZY=3Dy, PREEMPT_DYNAMIC=3Dn), which selects PREEMPTION will run with PREEMPT_RCU=3Dn. The combination (PREEMPT_LAZY=3Dy, PREEMPT_DYNAMIC=3Dy), will run with PREEMPT_RCU=3Dy. Cc: Paul E. McKenney Cc: Peter Zijlstra Signed-off-by: Ankur Arora --- kernel/rcu/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index 3e079de0f5b4..1bfe7016724f 100644 --- a/kernel/rcu/Kconfig +++ b/kernel/rcu/Kconfig @@ -18,7 +18,7 @@ config TREE_RCU =20 config PREEMPT_RCU bool - default y if PREEMPTION + default y if (PREEMPT || PREEMPT_RT || PREEMPT_DYNAMIC) select TREE_RCU help This option selects the RCU implementation that is --=20 2.43.5