On Tue, Oct 11, 2022 at 7:10 PM Frederic Weisbecker <frederic@xxxxxxxxxx> wrote:
>
> On Tue, Oct 11, 2022 at 06:01:31PM +0000, Joel Fernandes (Google) wrote:
> > @@ -269,10 +294,14 @@ static void wake_nocb_gp_defer(struct rcu_data *rdp, int waketype,
> > raw_spin_lock_irqsave(&rdp_gp->nocb_gp_lock, flags);
> >
> > /*
> > - * Bypass wakeup overrides previous deferments. In case
> > - * of callback storm, no need to wake up too early.
> > + * Bypass wakeup overrides previous deferments. In case of
> > + * callback storm, no need to wake up too early.
> > */
> > - if (waketype == RCU_NOCB_WAKE_BYPASS) {
> > + if (waketype == RCU_NOCB_WAKE_LAZY &&
> > + READ_ONCE(rdp->nocb_defer_wakeup) == RCU_NOCB_WAKE_NOT) {
>
> No need for READ_ONCE() here.
>
> > + mod_timer(&rdp_gp->nocb_timer, jiffies + jiffies_till_flush);
> > + WRITE_ONCE(rdp_gp->nocb_defer_wakeup, waketype);
> > + } else if (waketype == RCU_NOCB_WAKE_BYPASS) {
> > mod_timer(&rdp_gp->nocb_timer, jiffies + 2);
> > WRITE_ONCE(rdp_gp->nocb_defer_wakeup, waketype);
> > } else {
> > @@ -611,6 +682,8 @@ static void nocb_gp_wait(struct rcu_data *my_rdp)
> > unsigned long flags;
> > bool gotcbs = false;
> > unsigned long j = jiffies;
> > + bool lazy = false;
> > + long lazy_ncbs;
>
> Looks like lazy_ncbs can be declared withing the loop, as well as bypass_cbs.
>
> Anyway, apart from such boring cosmectics:
>
> Acked-by: Frederic Weisbecker <frederic@xxxxxxxxxx>
Thanks, I folded the cosmetic suggestions with the Ack and pushed it to:
https://github.com/joelagnel/linux-kernel.git (branch rcu-next-oct.12.22)
thanks,
- Joel
