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    SubjectRe: 2.6.28-rc9: oprofile regression
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    hm, it seems a bit more complicated than i originally thought.

    trying to reconstruct commit b99170288421c79f0c2efa8b33e26e65f4bb7fb8, i
    found, that resetting counter_width in ppro_setup_ctrs, causes the
    issue. reverting part of the patch, resolved the issue:

    --- a/arch/x86/oprofile/op_model_ppro.c
    +++ b/arch/x86/oprofile/op_model_ppro.c
    @@ -79,8 +79,8 @@ static void ppro_setup_ctrs(struct op_msrs const * const msrs)
    if (cpu_has_arch_perfmon) {
    union cpuid10_eax eax;
    eax.full = cpuid_eax(0xa);
    - if (counter_width < eax.split.bit_width)
    - counter_width = eax.split.bit_width;
    +// if (counter_width < eax.split.bit_width)
    +// counter_width = eax.split.bit_width;
    }

    /* clear all counters */

    however, trying to apply this patch to 2.6.28, the behavior is the same
    as before (one NMI) ... so possibly, it is a combination of two bugs,
    with similar symptoms ...

    hth, tim

    --
    tim@klingt.org
    http://tim.klingt.org

    Your mind will answer most questions if you learn to relax and wait
    for the answer.
    William S. Burroughs
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