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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U5

    * Kevin Hilman <kevin@hilman.org> wrote:

    > > the generic semaphore implementation (which uses rwsems) makes it
    > > possible to use the deadlock detection mechanism for all the mutex types
    > > we currently have: semaphores, rw-semaphores, spinlock-mutexes and
    > > rwlock-mutexes. Another benefit is that PREEMPT_REALTIME becomes much
    > > more portable this way. (although it's still x86-only at the moment.)
    >
    > Speaking of portability, is anyone yet working on ports to other
    > platforms? I'm particularily interested in ARM.

    i'll do x64 a couple of days after stability has been reached. I dont
    know of any ARM efforts though.

    a good starting point would be to enhance the generic-hardirqs framework
    for ARM. Generic-hardirqs is a portion of the PREEMPT_REALTIME patch
    that i've split out and submitted upstream, and which is expected to be
    merged into 2.6.10. The generic irq subsystem makes the irq-threading
    feature really simple and maintainable. So for PREEMPT_REALTIME to work
    on ARM the first step is to enable generic-hardirqs on ARM. (which is
    far from simple though.)

    Ingo
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