Re: [PATCH] rcu: use try_cmpxchg in check_cpu_stall

[Joel Fernandes]

Hey Steve,

On Tue, Feb 28, 2023 at 7:08 PM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
[...]
> >
> > >
> > > But in your case, we don't need to update js, in which case the
> > > try_cmpxchg() does.
> >
> > Right, it has lesser value here but I'm curious why you feel it also
> > doesn't belong in that ring buffer loop you shared (or did you mean,
> > it does belong there but not in other ftrace code modified by Uros?).
>
> The ring buffer patch had more than one change, where half the updates were
> fine, and half were not.

Thanks for all the clarifications. Good to know such loop design
patterns can benefit from it!


 - Joel