linux-kernel - Re: [PATCH v3 01/22] hardirq/nmi: Allow nested nmi

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Message-ID: <20200219165650.GB32346@zn.tnic>
Date:   Wed, 19 Feb 2020 17:56:50 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        mingo@...nel.org, joel@...lfernandes.org,
        gregkh@...uxfoundation.org, gustavo@...eddedor.com,
        tglx@...utronix.de, paulmck@...nel.org, josh@...htriplett.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        luto@...nel.org, tony.luck@...el.com, frederic@...nel.org,
        dan.carpenter@...cle.com, mhiramat@...nel.org,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Petr Mladek <pmladek@...e.com>
Subject: Re: [PATCH v3 01/22] hardirq/nmi: Allow nested nmi_enter()

On Wed, Feb 19, 2020 at 10:31:26AM -0500, Steven Rostedt wrote:
> Probably should document somewhere (in a comment above nmi_enter()?)
> that we allow nmi_enter() to nest up to 15 times.

Yah, and can we make the BUG_ON() WARN_ON or so instead, so that there's
at least a chance to be able to catch it for debugging. Or is the box
going to be irreparably wedged after the 4 bits overflow?

-- 
Regards/Gruss,
    Boris.

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