Re: [patch 3/3] tick: Annotate tick_do_timer_cpu data races

[Paul E. McKenney]

On Wed, Dec 16, 2020 at 10:23:57PM +0100, Thomas Gleixner wrote:
> On Wed, Dec 16 2020 at 13:19, Paul E. McKenney wrote:
> > On Wed, Dec 16, 2020 at 01:27:43AM +0100, Thomas Gleixner wrote:
> >> So my intent was to document that this code does not care about anything
> >> else than what I'd consider to be plain compiler bugs.
> >> 
> >> My conclusion might be wrong as usual :)
> >
> > 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().
> 
> Could this be spelled out somewhere in Documentation/ please?

Good point!  I will put a patch together.

							Thanx, Paul