Commits
Tejun Heo committed bc2ae0f5bb2
workqueue: drop @bind from create_worker() Currently, create_worker()'s callers are responsible for deciding whether the newly created worker should be bound to the associated CPU and create_worker() sets WORKER_UNBOUND only for the workers for the unbound global_cwq. Creation during normal operation is always via maybe_create_worker() and @bind is true. For workers created during hotplug, @bind is false. Normal operation path is planned to be used even while the CPU is going through hotplug operations or offline and this static decision won't work. Drop @bind from create_worker() and decide whether to bind by looking at GCWQ_DISASSOCIATED. create_worker() will also set WORKER_UNBOUND autmatically if disassociated. To avoid flipping GCWQ_DISASSOCIATED while create_worker() is in progress, the flag is now allowed to be changed only while holding all manager_mutexes on the global_cwq. This requires that GCWQ_DISASSOCIATED is not cleared behind trustee's back. CPU_ONLINE no longer clears DISASSOCIATED before flushing trustee, which clears DISASSOCIATED before rebinding remaining workers if asked to release. For cases where trustee isn't around, CPU_ONLINE clears DISASSOCIATED after flushing trustee. Also, now, first_idle has UNBOUND set on creation which is explicitly cleared by CPU_ONLINE while binding it. These convolutions will soon be removed by further simplification of CPU hotplug path. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>