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    SubjectRe: [patch] smp-2.3.43-B5, x86 SMP fixes
    Ingo Molnar wrote:
    >
    > accidentally attached B1, B5 is at:
    >
    >

    I have one question:
    http://www.redhat.com/~mingo/smp-2.3.43-B5:
    + send_IPI_mask(cpumask, INVALIDATE_TLB_VECTOR);
    +
    + while (flush_cpumask)
    + /* nothing. lockup detection does not belong here */;
    +

    Why?
    * we are running with enabled interrupts, NMI detection won't find the
    lock-up.
    * "stuck on TLB IPI wait" messages are quite common - perhaps as common
    as bad hardware ;). I don't think that we can ignore them.
    * it will be easy to add lockup detection: there are 4 function on i386
    that wait for inter processor synchronization (wait_on_irq, wait_on_bh,
    smp_call_function, and flush_tlb_others), and I'm preparing a helper
    function that prints a meaningfull back trace (better than show()).

    --
    Manfred

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