cpumask: convert kernel/workqueue.c
Impact: Reduce memory usage, use new cpumask API.
cpu_populated_map becomes a cpumask_var_t, and cpu_singlethread_map is
simply a cpumask pointer: it's simply the cpumask containing the first
possible CPU anyway.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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