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    Subject[PATCH tip/core/rcu 1/9] rcu: Permit RCU_FAST_NO_HZ to be used by TREE_PREEMPT_RCU
    Date
    From: Paul E. McKenney <paul.mckenney@linaro.org>

    The new implementation of RCU_FAST_NO_HZ is compatible with preemptible
    RCU, so this commit removes the Kconfig restriction that previously
    prohibited this.

    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    init/Kconfig | 10 +++++-----
    1 files changed, 5 insertions(+), 5 deletions(-)

    diff --git a/init/Kconfig b/init/Kconfig
    index 43298f9..82b6a4c 100644
    --- a/init/Kconfig
    +++ b/init/Kconfig
    @@ -469,14 +469,14 @@ config RCU_FANOUT_EXACT

    config RCU_FAST_NO_HZ
    bool "Accelerate last non-dyntick-idle CPU's grace periods"
    - depends on TREE_RCU && NO_HZ && SMP
    + depends on NO_HZ && SMP
    default n
    help
    This option causes RCU to attempt to accelerate grace periods
    - in order to allow the final CPU to enter dynticks-idle state
    - more quickly. On the other hand, this option increases the
    - overhead of the dynticks-idle checking, particularly on systems
    - with large numbers of CPUs.
    + in order to allow CPUs to enter dynticks-idle state more
    + quickly. On the other hand, this option increases the overhead
    + of the dynticks-idle checking, particularly on systems with
    + large numbers of CPUs.

    Say Y if energy efficiency is critically important, particularly
    if you have relatively few CPUs.
    --
    1.7.3.2


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