From owner-freebsd-usb@FreeBSD.ORG  Tue May 31 20:12:56 2011
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Date: Wed, 1 Jun 2011 00:12:51 +0400
From: Lev Serebryakov <lev@FreeBSD.org>
Organization: FreeBSD
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Subject: Changes to usb/serial: how to distinguish between old and new
	interfaces in 8-STABLE and 9-CURRENT branches?
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Hello, Freebsd-usb.

  I'm author of `comms/umcs7840' port, which is module for usbcom,
like `uftdi' and `uplcom' in base system.

  Last changes, committed to 8-STABLE (and, earlier to HEAD), breaks
some API/ABI for such modules.

 I have tow questions:

 (1) How could I detect which version have user at compile time? I
don't use any autoconf/automake framework, my build framework is baed
on FreeBSD-native bsd.*.mk framework, so I need some define or
something like this to distinguish these versions. I could not find
anything suitable in revision 221612 commit.

 (2) WHY, OR WHY old module was loaded without problems?! ABI is
 broken (ucom_detach()? size of struct ucom_softc) and old module
 should complain on load, IMHO! Users will be very surprised when
 computer will reboot after system update!

--=20
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>