Re: [RFC 2/2] rcu: Remove ->dynticks_nmi_nesting from struct rcu_dynticks

[Andy Lutomirski]

On Mon, Jun 25, 2018 at 3:16 PM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
> On Mon, 25 Jun 2018 13:47:45 -0700
> Andy Lutomirski <luto@xxxxxxxxxx> wrote:
>
> >
> > As a straightforward example, NMI and MCE can nest inside each other.
>
> But I'm not sure how stable the machine becomes when MCE's start
> interrupting NMIs. Also, can MCE callbacks use RCU?
>
> > IIRC we treat #DB somewhat NMI-ish-ly as well.
>
> And #DB is something I think we finally said shouldn't be done in NMIs,
> IIRC.
>

No one ever applied the patch to make it so, so we still support it.