[PATCH v2 0/2] workqueue: Make the workqueue code PREEMPT_RT safe

[Sebastian Andrzej Siewior]

The series changes `wq_manager_wait' from waitqueues to simple
waitqueues and its internal locking (pool::lock and wq_mayday_lock) to
raw spinlocks so that workqueues can be used on PREEMPT_RT from truly
atomic context.

v1âv2: Use rcuwait instead of swait.

v1 can be found at
   https://lore.kernel.org/lkml/20200513162732.977489-1-bigeasy@xxxxxxxxxxxxx/

Sebastian