Hotplug CPUs for i386 2.5.44

Doesn't apply to -mm5 because someone did wierd things with the CPU
placement in driverfs, which clashes with this patch which moves it to
kernel/cpu.c...

Usage:
1) Apply patch, and boot resulting kernel.
2) echo 0 > /devices/root/sys/cpu0/online
3) echo 1 > /devices/root/sys/cpu0/online

The CPU actually spins with interrupts off, doing cpu_relax() and
polling a variable.  It's basically useful for testing the unplug
infrastructure and benchmarking.

http://www.kernel.org/pub/linux/kernel/people/rusty/patches/hotcpu-x86-28-10-2002.2.5.44.diff.gz

Cheers!
Rusty.
--
  Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
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