Messages in this thread | | | Date | Wed, 17 Jul 2013 00:19:42 +0530 | From | Raghavendra K T <> | Subject | Re: [PATCH RFC V10 15/18] kvm : Paravirtual ticketlocks support for linux guests running on KVM hypervisor |
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On 07/16/2013 09:18 PM, Peter Zijlstra wrote: > On Tue, Jul 16, 2013 at 09:02:15AM +0300, Gleb Natapov wrote: >> BTW can NMI handler take spinlocks? > > No -- that is, yes you can using trylock, but you still shouldn't.
Thanks Peter for the clarification.
I had started checking few of nmi handlers code to confirm. Did saw a raw spinlock in drivers/acpi/apei/ghes.c, but then stopped.
> >> If it can what happens if NMI is >> delivered in a section protected by local_irq_save()/local_irq_restore()? > > You deadlock. >
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