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    SubjectRe: preemptible RCU bug (was Re: [git pull] scheduler changes for v2.6.25)

    * Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:

    > > Sorry, no help available for this option yet.
    >
    > Good catch!!!
    >
    > This patch supplies help text for the "RCU implementation type" kernel
    > configuration choice.

    thanks applied to sched.git. (see the patch below - the config option is
    in init/Kconfig in mainline, not in kernel/Kconfig.preempt)

    Ingo

    ------------->
    Subject: RCU: add help text for "RCU implementation type"
    From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>

    This patch supplies help text for the "RCU implementation type"
    kernel configuration choice.

    Reported-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    ---

    init/Kconfig | 8 ++++++++
    1 file changed, 8 insertions(+)

    Index: linux/init/Kconfig
    ===================================================================
    --- linux.orig/init/Kconfig
    +++ linux/init/Kconfig
    @@ -779,6 +779,14 @@ config PREEMPT_NOTIFIERS
    choice
    prompt "RCU implementation type:"
    default CLASSIC_RCU
    + help
    + This allows you to choose either the classic RCU implementation
    + that is designed for best read-side performance on non-realtime
    + systems, or the preemptible RCU implementation for best latency
    + on realtime systems. Note that some kernel preemption modes
    + will restrict your choice.
    +
    + Select the default if you are unsure.

    config CLASSIC_RCU
    bool "Classic RCU"

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