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

Fri, 24 Oct 2008 05:46:09 -0700

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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