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    SubjectRe: [PATCH for 2.5] preemptible kernel
    On Wed, 21 Mar 2001, David S. Miller wrote:
    > Basically, anything which uses smp_processor_id() would need to
    > be holding some lock so as to not get pre-empted.

    Not necessarily. Another solution for the smp_processor_id() case is
    to ensure that the task can only be scheduled on the current CPU for the
    duration that the value of smp_processor_id() is used. Or, if the
    critical region is very short, to disable interrupts on the local CPU.

    Nigel Gamble
    Mountain View, CA, USA.

    MontaVista Software

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