Fw: PERFORCE change 101080 for review

[M. Warner Losh]

John,

I think the following change is good reguardless of how the current
discussions about how to get acpi devices wired falls out.  It
modifies devclass unit number assignment to treat a pre-existing
device as 'taken' as well as one that just might be hinted at.

It has the nice side effect of obviating the need for device_set_unit,
which I added holding my nose a long time ago.  The reason I didn't go
with this approach was that at the time (4.x or maybe 3.x) there
wasn't the hints infrastructure we have today, and I never went back
to revisit this kludge to remove it.

Please let me know what you think of this.

Warner
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Subject: PERFORCE change 101080 for review
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