error: implicit declaration of function 'cpu_die'

How can I fix this properly?
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.

The include order was changed recently, as this kernel .config built ok with 2.6.13.
I see cpu_die was introduced recently in include/asm-ppc/smp.h, in 2.6.14-rc1.


  CC      arch/ppc/kernel/idle.o
arch/ppc/kernel/idle.c: In function 'default_idle':
arch/ppc/kernel/idle.c:58: error: implicit declaration of function 'cpu_die'
make[1]: *** [arch/ppc/kernel/idle.o] Error 1


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