From: Rusty Russell on
This patch series finally gets the last remaining cpumask_t in the core
kernel, and thus allows us to make 'struct cpumask' undefined in the
CONFIG_CPUMASK_OFFSTACK case. This gives us confidence that noone is
manipulating a cpumask except via the cpumask_ functions, so we can
finally short-allocate them (ie. nr_cpu_ids not NR_CPUS) for the

This series has been tested on 32-bit only, so handle with care!

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