On Wed, Dec 16, 2020 at 01:19:31PM -0800, Paul E. McKenney wrote: > Given that there is no optimization potential, then the main reason to use > data_race() instead of *_ONCE() is to prevent KCSAN from considering the > accesses when looking for data races. But that is mostly for debugging > accesses, in cases when these accesses are not really part of the > concurrent algorithm. > > So if I understand the situation correctly, I would be using *ONCE().
Huh, what, why? The code doesn't need READ_ONCE(), it merely wants to tell kasan that the race it observes is fine and as to please shut up. IOW data_race() is accurate and right.
