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    SubjectRe: [Bug #13116] Can't boot with nosmp
    On Sun,  7 Jun 2009 11:52:49 +0200 (CEST)
    "Rafael J. Wysocki" <rjw@sisk.pl> wrote:

    > This message has been generated automatically as a part of a report
    > of recent regressions.
    >
    > The following bug entry is on the current list of known regressions
    > from 2.6.29. Please verify if it still should be listed and let me know
    > (either way).
    >
    >
    > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13116
    > Subject : Can't boot with nosmp
    > Submitter : Stephen Hemminger <shemminger@vyatta.com>
    > Date : 2009-04-15 4:18 (54 days old)
    > References : http://marc.info/?l=linux-kernel&m=123976917817920&w=4
    > Handled-By : Dan Williams <dan.j.williams@intel.com>
    >
    >

    I suspect this bit of code in dmaengine is the culprit:

    /* redistribute available channels */
    n = 0;
    for_each_dma_cap_mask(cap, dma_cap_mask_all)
    for_each_online_cpu(cpu) {
    if (num_possible_cpus() > 1)
    chan = nth_chan(cap, n++);
    else
    chan = nth_chan(cap, -1);

    Why does num_possible_cpus() == 1 have to be a special case?
    --


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