linux-kernel - Re: [RFC PATCH 1/4] genirq: Provide basic NMI management for interrupt lines

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Message-ID: <20180717112842.GT2476@hirez.programming.kicks-ass.net>
Date:   Tue, 17 Jul 2018 13:28:42 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Julien Thierry <julien.thierry@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        ricardo.neri-calderon@...ux.intel.com, marc.zyngier@....com,
        mingo@...nel.org
Subject: Re: [RFC PATCH 1/4] genirq: Provide basic NMI management for
 interrupt lines

On Tue, Jul 17, 2018 at 12:13:44PM +0100, Julien Thierry wrote:

> I'm a bit unsure about this one. In practice NMI handlers shouldn't take
> forever nor block the system for too long.

On x86 at least, kgdb can be in NMI context for extended periods. Not
saying that's a good thing, but on occasion we get reports on stuff
coming apart because of that.

(most times we tell people to not do that then)