default IRQ affinity change in v2.6.27 (breaking several SMP PPC based systems)

[Kumar Gala]

It appears the default IRQ affinity changes from being just cpu 0 to  
all cpu's.  This breaks several PPC SMP systems in which only a single  
processor is allowed to be selected as the destination of the IRQ.

What is the right answer in fixing this?  Should we:

	cpumask_t irq_default_affinity = 1;

instead of

	cpumask_t irq_default_affinity = CPU_MASK_ALL?

- k
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