On Sun,  7 Jun 2009 11:52:49 +0200 (CEST)
"Rafael J. Wysocki" <[email protected]> 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 <[email protected]>
> Date          : 2009-04-15 4:18 (54 days old)
> References    : http://marc.info/?l=linux-kernel&m=123976917817920&w=4
> Handled-By    : Dan Williams <[email protected]>
> 
> 

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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