It's trying to describe an empty set of cpus. This is denoted by
CPU_MASK_NONE in the cpumask_t bits.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to email@example.com
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/