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Date: Thu, 7 Nov 2002 07:44:51 -0800 (PST)
From: Linus Torvalds <torvalds@transmeta.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Werner Almesberger <wa@almesberger.net>,
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Subject: Re: [lkcd-devel] Re: What's left over.
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On 7 Nov 2002, Eric W. Biederman wrote:
> 
> There are currently 2 cases that it would be nice to have work.
> 1) Load a new kernel and immediately execute it.
> 2) Load a new kernel and execute it on panic.

I really don't think (1) is _ever_ a valid thing to do.

The fact is, loading a new kernel wants filesystems and a fully working 
system. While executing it wants the filesystems quiescent.

> panic does not call sys_reboot it rolls that functionality by hand.

Forget about panic for now. It's a design issue - it should be possible to 
work, but somebody else can do it if the infrastructure is done right.

> In a unified design I can buffer the image in the anonymous pages of a
> user space process just as well as I can in locked down kernel memory.

And in a unified design, I won't apply the patches. It's that simple.

		Linus

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