Fix regression. Make hot unlplug of CPU0 work again.

[Tony Breeds]

On Fri, Oct 05, 2007 at 01:52:41PM +1000, Tony Breeds wrote:
> Early in the 2.6.23 cycle we broke the ability to offline cpu0
> (7ccb4a662462616f6be5053e26b79580e02f1529).  This patch fixes that by
> ensuring that the (xics)  default irq server, will not be 0 when taking
> cpu0 offline.
> 
> Also catches a use of irq, when virq should be used (I think that the
> last one).

Hmm testing, this on a JS21 shows that it doesn't work.  I guess I'll go
back to the drawing board.

Yours Tony

  linux.conf.au        http://linux.conf.au/ || http://lca2008.linux.org.au/
  Jan 28 - Feb 02 2008 The Australian Linux Technical Conference!