[Bug 225450] 11.1-* panics on AMD Opteron 2k due to EARLY_AP_STARTUP

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225450

--- Comment #20 from John Baldwin <jhb at FreeBSD.org> ---
Grrr, not sure why my patch didn't prevent it from recursing.  You could try
'|| cold' instead of '|| n == 1' perhaps.  You could also try changing the
'DELAY(1)' in _mtx_lock_indefinite_check() in sys/kern/kern_mutex.c to be
something like 'if (cold) cpu_spinwait(); else DELAY(1);' instead of the 'n ==
1' hack.

Oh, I see why 'n == 1' didn't help.  The early_delay callback that is used when
that 'n == 1' check fails is i8254_delay (set in amd64/amd64/machdep.c).

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