Hi,

> arch/ppc/kernel/idle.c includes linux/smp.h, which includes asm-smp.h
> only if CONFIG_SMP is defined.
> As a result, cpu_die remains undefined for non-SMP builds.

I have used the attached patch for my tree[1], but this needs to be 
cross-checked with the other architectures.

    Simon

[1] where I merge the APUS stuff by Roman Zippel -- 
http://www.psi5.com/~geier/linux-2.6-apus.git