Re: [patch V3 15/64] rtmutex: Provide rt_mutex_base_is_locked()

[Davidlohr Bueso]

> +/**
> + * rt_mutex_base_is_locked - is the rtmutex locked
> + * @lock: the mutex to be queried
> + *
> + * Returns true if the mutex is locked, false if unlocked.
> + */
> +static inline bool rt_mutex_base_is_locked(struct rt_mutex_base *lock)
> +{
> +	return lock->owner != NULL;

Does this want to be READ_ONCE()? While not a big deal because
it's ultimately only used by drm debugging, I don't see any harm
in avoiding potential tearing.

Thanks,
Davidlohr