From owner-freebsd-questions@FreeBSD.ORG  Fri Jul 23 07:47:39 2010
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Date: Fri, 23 Jul 2010 09:47:25 +0200
From: Ruben de Groot <mail25@bzerk.org>
To: "Alexandre L." <axelbsd@ymail.com>
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Cc: freebsd-questions@freebsd.org, zaxis <z_axis@163.com>
Subject: Re: Re : can i just upgrade the 8.1 kernel ?
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On Fri, Jul 23, 2010 at 07:37:59AM +0000, Alexandre L. typed:
> I think you have not understood the handbook.
> You MUST rebuild both base system and kernel to correctly upgrade your FreeBSD box to 8.1-RELEASE. 
> If you let your system in 8.0-RELEASE and compile a kernel with 8.1 sources, you will have problem.

s/will have/might have/

Usually, on the same branch, a newer kernel will just work. That's the purpose of ABI compatibility.

Ruben