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Date: Thu, 23 Aug 2012 17:41:49 -0500
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From: Mark Felder <feld@feld.me>
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Cc: Walter Hurry <walterhurry@gmail.com>
Subject: Re: FreeBSD 9.1-RC1 Available...
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On Thu, 23 Aug 2012 12:37:04 -0500, Walter Hurry <walterhurry@gmail.com>  
wrote:

> One thing (welcome, but puzzling) which surprised me was that my
> vboxguest.ko did *not* need to be recompiled. How did the upgrade manage
> that?

FreeBSD has a stable ABI unlike Linux. A kernel module compiled for any  
9.x release should work on any other 9.x release without needing to be  
recompiled.