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    SubjectRe: [PATCH][2.5] fix preempt-issues with smp_call_function()
    Alan Cox <> wrote:
    > On Wed, 2003-02-26 at 10:28, Andrew Morton wrote:
    > > Dave Jones <> wrote:
    > > >
    > > > btw, (unrelated) shouldn't smp_call_function be doing magick checks
    > > > with cpu_online() ?
    > >
    > > Looks OK? It sprays the IPI out to all the other CPUs in cpu_online_map,
    > > and waits for num_online_cpus()-1 CPUs to answer.
    > You cannot do that by counting without a lot of care. IPI messages do not have
    > guaranteed "once only" semantics. On an error a resend can and has been observed
    > to cause a reissue of an IPI on PII/PIII setups

    If that resend results in delivery of an actual extra interrupt, the
    resent-to CPU can start playing with stuff which used to be on the sender's
    stack and the box goes splat.

    Didn't sct have a fix for that?
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