[Bug 219882] [SMP][patch] 11.1-PRERELEASE panics at CPU detection on a single CPU i386 machine

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219882

--- Comment #3 from John Baldwin <jhb at FreeBSD.org> ---
Created attachment 183451
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183451&action=edit
noassign_on_up.patch

Please try this patch instead.  In the !EARLY_AP_STARTUP case, the 'assign_cpu'
variable is never set on a UP system, so it results in never trying to assign
CPUs.  This patch restores that by checking for an SMP system explicitly before
trying to assign a CPU.  I think the panic in the atpic method is still a good
canary for ensuring the calling code is doing the right thing.

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