On 2020-03-04 16:35:26 [-0800], Paul E. McKenney wrote: > Hello! Hi Paul, > Or is there some other reason why {S,}RCU needs to use swait that I > am forgetting? swait can be used in hardirq-context (on RT) that is in a section within local_irq_save() / raw_spin_lock() and so. wait on the hand uses spinlock_t which can not be used in this context. So if you have no users which fall into that category then you could move back to wait.h. > Thanx, Paul Sebastian