workqueue: change argument of worker_maybe_bind_and_lock() to @pool
worker_maybe_bind_and_lock() currently takes @worker but only cares about @worker->pool. This patch updates worker_maybe_bind_and_lock() to take @pool instead of @worker. This will be used to better define synchronization rules regarding rescuer->pool updates. This doesn't introduce any functional change. tj: Updated the comments and description. Signed-off-by: NLai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: NTejun Heo <tj@kernel.org>
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