Re: [PATCH 25/48] rcu: Mark writes to rcu_sync ->gp_count field

Paul E. McKenney
2024-05-10T13:58:51Z

On Fri, May 10, 2024 at 03:18:50PM +0200, Oleg Nesterov wrote:
> On 05/07, Paul E. McKenney wrote:
> >
> > By the stricter data-race rules used in RCU code [1],
> ...
> > [1] https://docs.google.com/document/d/1FwZaXSg3A55ivVoWffA9iMuhJ3_Gmj_E494dLYjjyLQ/edit?usp=sharing
>
> I am getting more and more confused...
>
> Does this mean that KCSAN/etc treats the files in kernel/rcu/
> differently than the "Rest of Kernel"? Or what?

Yes.

> And how is it enforced?

By me running rcutorture with KCSAN with the Kconfig options listed in
that docusment.

Thanx, Paul