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    SubjectRe: [PATCH -tip] Switch arm defconfig files from CONFIG_CLASSIC_RCU to CONFIG_TREE_RCU.

    * Sam Ravnborg <sam@ravnborg.org> wrote:

    > On Thu, Dec 25, 2008 at 09:36:11AM +0100, Ingo Molnar wrote:
    > >
    > > below is the fix for another small buglet that hits architectures that do
    > > not include kernel/Kconfig.preempt.
    >
    > What is needed to let all architectures include Kconfig.preempt?
    > We should not advertise preemption if not supported,
    > but we could do this by a simple Kconfig symbol:
    >
    > config HAVE_PREEMPT
    > bool
    >
    > And let all architectures that supports preemption do:
    >
    > config "ARCH"
    > select HAVE_PREEMPT
    >
    > But maybe there is a simpler solution

    Since a preemptive kernel is not supported by all architectures, there has
    to be per arch ways to express this - i.e. i think your solution is the
    cleanest.

    Ingo


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