Re: [PATCH RFC 8/9] rtmutex: Use accessor for hrtimer_sleeper ->task field

[Paul E. McKenney]

On Tue, Aug 04, 2026 at 05:32:31PM +0000, Dmitry Ilvokhin wrote:
> On Thu, Jul 30, 2026 at 05:40:18PM -0700, Paul E. McKenney wrote:
> > The hrtimer_sleeper structure's ->task field is used as a flag to indicate
> > that the associated hrtimer has expired.  This means that the hrtimer
> > handler can be storing to this field while other code is loading from it
> > to check for expiry.  Note that additional races appear for hrtimers that
> > can be restarted, which could be argued to be a user error.  However, that
> > is no reason to let the compiler introduce additional confusion, and to
> > this end, the hrtimer_sleeper_task_get() was introduced, use of which also
> > has the benefit of avoiding open-code access to hrtimer_sleeper innards.
> > 
> > Therefore, apply this accessor to rt_mutex_slowlock_block().
> > 
> > KCSAN located this issue.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
> 
> Reviewed-by: Dmitry Ilvokhin <d@xxxxxxxxxxxx>

I will apply these on my next rebase, thank you!

							Thanx, Paul