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Date: Thu, 22 Jun 2006 08:45:55 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
To: "Randy.Dunlap" <rdunlap@xenotime.net>
cc: Nathan Lynch <ntl@pobox.com>, akpm@osdl.org,
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Subject: Re: [PATCH] stop on cpu lost
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On Thu, 22 Jun 2006, Randy.Dunlap wrote:

> Sounds much better than just killing the process.

Right and having active interrupts or devices using that processor should 
also stop offlining a processor.

So just remove everything from a processor before offlining. If you cannot 
remove all users then the processor cannot be offlined.