On Tue, Jan 24, 2023 at 10:42:24AM -0500, Waiman Long wrote: > I would suggest to do it as suggested by PeterZ. Instead of set_bit(), > however, it is probably better to use atomic_long_or() like > > atomic_long_or_relaxed(RT_MUTEX_HAS_WAITERS, (atomic_long_t *)&lock->owner) That function doesn't exist, atomic_long_or() is implicitly relaxed for not returning a value.