Merge tag 'wq-for-7.3-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

Pull workqueue fixes from Tejun Heo:

 - An unbound worker pool could be freed while still reachable through
   the pending-activation list, leading to a use-after-free. Unlink
   before dropping the reference

 - On PREEMPT_RT, the BH workqueue kick raised softirqs from preemptible
   context, tripping a lockdep assertion and possibly losing
   concurrently raised softirq bits

 - Draining BH work off a dead CPU nests two pools' callback locks,
   which lockdep misreported as recursive locking. The nesting cannot
   deadlock. Annotate it

 - Reject watchdog thresholds that overflow the conversion to jiffies

 - Make the drgn workqueue dump script work again on kernels and vmcores
   from before the workqueue attrs field rename

* tag 'wq-for-7.3-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  tools/workqueue/wq_dump.py: Support backward compatibility for wq->attrs rename
  workqueue: reject watchdog thresholds that overflow jiffies
  workqueue: Fix unbound pool lifetime for pending pwqs
  workqueue: Use raise_softirq() to trigger softirq in irq_work handler
  workqueue: Annotate cb_lock nesting when draining a dead BH pool

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