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

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Message-ID: <20180625181638.7fb84df6@gandalf.local.home>
Date:   Mon, 25 Jun 2018 18:16:38 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        joel@...lfernandes.org, Byungchul Park <byungchul.park@....com>,
        byungchul park <max.byungchul.park@...il.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@....com
Subject: Re: [RFC 2/2] rcu: Remove ->dynticks_nmi_nesting from struct
 rcu_dynticks

On Mon, 25 Jun 2018 13:47:45 -0700
Andy Lutomirski <luto@...nel.org> 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.

-- Steve