workqueue: restore CPU affinity of unbound workers on CPU_ONLINE
With the recent addition of the custom attributes support, unbound pools may have allowed cpumask which isn't full. As long as some of CPUs in the cpumask are online, its workers will maintain cpus_allowed as set on worker creation; however, once no online CPU is left in cpus_allowed, the scheduler will reset cpus_allowed of any workers which get scheduled so that they can execute. To remain compliant to the user-specified configuration, CPU affinity needs to be restored when a CPU becomes online for an unbound pool which doesn't currently have any online CPUs before. This patch implement restore_unbound_workers_cpumask(), which is called from CPU_ONLINE for all unbound pools, checks whether the coming up CPU is the first allowed online one, and, if so, invokes set_cpus_allowed_ptr() with the configured cpumask on all workers. Signed-off-by: NTejun Heo <tj@kernel.org> Reviewed-by: NLai Jiangshan <laijs@cn.fujitsu.com>
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