Re: [PATCH] Fix data race in mark_rt_mutex_waiters

[Peter Zijlstra]

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.