Re: [PATCH 08/13] xen/pvticketlock: disable interrupts whileblocking

[Peter Zijlstra]

On Fri, 2011-09-02 at 12:29 -0700, Jeremy Fitzhardinge wrote:
> 
> > I know that its generally considered bad form, but there's at least one
> > spinlock that's only taken from NMI context and thus hasn't got any
> > deadlock potential.
> 
> Which one? 

arch/x86/kernel/traps.c:nmi_reason_lock

It serializes NMI access to the NMI reason port across CPUs.
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