Merge tag 'wq-for-7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

Pull workqueue updates from Tejun Heo:

 - Flushing a workqueue now visits only the queues used since the last
   flush instead of one per possible CPU. Idle flushes get 10 to 100
   times faster on large machines, which XFS hits on every log force.

 - Per-cpu workqueues are built through the same attribute path as
   unbound ones and get a max_active of their own, continuing the work
   to turn them into an affinity scope of unbound workqueues.

 - New tracepoints for work items turning CPU-intensive, rescuer mayday
   and rescue events, and BH workers yielding with work pending.

 - A KCSAN annotation and small cleanups

* tag 'wq-for-7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: mark pool->nr_running as __data_racy
  workqueue: BUG_ON() a pwq release before workqueue_init()
  workqueue: Derive the standard attrs from the workqueue flags
  workqueue: Give percpu workqueues their own max_active
  workqueue: Make flush_workqueue() visit only pwqs active since the last flush
  workqueue: Maintain pwq->total_in_flight
  workqueue: Add for_each_node_with_fallback()
  workqueue: Fix typo "upto" in comment
  workqueue: Add workqueue_bh_budget_yield tracepoint
  workqueue: Add workqueue_mayday and workqueue_rescued tracepoints
  workqueue: Add workqueue_cpu_intensive tracepoint
  workqueue: rename the pwq slot helpers shared with percpu
  workqueue: build percpu pwqs through the attrs path
  workqueue: make the default pwq optional
  workqueue: resolve the backing pool in alloc_pwq()
  workqueue: move the unbound-only attrs check to apply_workqueue_attrs()

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