linux-kernel - Re: Test some kernel feature without recompile

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Date:	Sun, 22 Mar 2009 23:21:07 -0400
From:	Bryan Donlan <bdonlan@...il.com>
To:	Dragoslav Zaric <dragoslav.zaric.kd@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Test some kernel feature without recompile

On Sun, Mar 22, 2009 at 6:43 AM, Dragoslav Zaric
<dragoslav.zaric.kd@...il.com> wrote:
> Hi,
>
> I know when you work on some kernel module, you can change code and load
> module again and test it, but what if you change some built in kernel
> .c file, why
> would I need to recompile whole kernel just to see what happens if I change one
> .c file ??
>
> Why can I just compile one changed .c file and copy it where compiled version of
> that file reside inside kernel tree? Or maybe there is some image info embedded
> inside compiled files, so that file must belong to specific image from
> which it is
> installed ?

ksplice can do this in some limited cases: http://www.ksplice.com/example-update

Obviously, changes which affect the structure of kernel datastructures
are more difficult to accomplish...
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