Re: [PATCH RFC 2/9] aio: Use accessor for hrtimer_sleeper ->task field

["Paul E. McKenney" <paulmck@kernel.org>]

On Fri, Jul 31, 2026 at 02:57:57PM +0200, Christian Brauner wrote:
> On 2026-07-30 17:40 -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.
> > 
> > KCSAN located this issue.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
> > Cc: Benjamin LaHaise <bcrl@kvack.org>
> > Cc: Alexander Viro <viro@zeniv.linux.org.uk>
> > Cc: Christian Brauner <brauner@kernel.org>
> > Cc: Jan Kara <jack@suse.cz>
> > Cc: Anna-Maria Behnsen <anna-maria@linutronix.de>
> > Cc: Frederic Weisbecker <frederic@kernel.org>
> > Cc: Thomas Gleixner <tglx@kernel.org>
> > Cc: <linux-aio@kvack.org>
> > Cc: <linux-fsdevel@vger.kernel.org>
> > ---
> 
> Reviewed-by: Christian Brauner (Amutable) <brauner@kernel.org>

Thank you both, and I will apply your tags on my next rebase.

							Thanx, Paul