RELENG_8 kernel as of Apr 14 does not boot

[Eugene Grosbein]

>>> Just update my 8.x kernel sources last weekend, and newly built kernel did
>>> not boot for me:
>>>
>>> link_elf: symbol mem_range_softc undefined
>>> KLD file acpi.ko - could not finalize loading
>>> kernel trap 12 with interrupts disabled
>>
>> Try to add 'device mem' to your kernel configuration.
> 
> :-)
> 
> I explicitly have "nodevice mem" and "nodevice io" in my config.  They are
> being loaded from /boot/loader.conf.  This worked fine for quite a while.
> 
> I will try to have it compiled-in, but would still prefer it fixed, or in
> case it cannot be fixed and mem.ko cannot be loaded separately from now on,
> appropriate entry in UPDATING.

It seems John Baldwin brought dependency of acpi.ko on device mem
4 days ago to RELENG_8 with MFC:

http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/acpica/acpi_wakeup.c#rev1.50.2.3

Eugene Grosbein