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Subject: Re: [PATCH 2/4] nmi: add generic nmi tracking state
From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
       Andrew Morton <akpm@linux-foundation.org>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       Steven Rostedt <srostedt@redhat.com>,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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Date: Fri, 06 Feb 2009 10:34:51 +0100
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On Fri, 2009-02-06 at 01:53 -0500, Steven Rostedt wrote:

> This code adds an in_nmi() macro that uses the current tasks preempt count
> to track when it is in NMI context. Other parts of the kernel can
> use this to determine if the context is in NMI context or not.
> 
> This code was inspired by the -rt patch in_nmi version that was
> written by Peter Zijlstra.

Which in turn I borrowed from Mathieu.