Re: Interrupt flow in the NetBSD kernel

[Kamil Rytarowski <n54%gmx.com@localhost>]

On 22.06.2015 19:07, David Young wrote:
> On Sun, Jun 21, 2015 at 08:01:47AM -0700, Matt Thomas wrote:
>>
>>> On Jun 21, 2015, at 7:30 AM, Kamil Rytarowski <n54%gmx.com@localhost> wrote:
>>>
>>> I have got few questions regarding the interrupt flow in the kernel.
>>> Please tell whether my understanding is correct.
>>
>> You are confusing interrupts with exceptions.  Interrupts are 
>> asynchronous events.  Exceptions are (usually) synchronous and
>> are the result of an instruction.
> 
> I took Kamil's question to be, "When interrupts at the highest priority
> level are blocked, can control flow still be interrupted?  How?"  The
> answer to the question is yes.  Both synchronous events (exceptions,
> such as "data abort" on ARM) and asynchronous events (non-maskable
> interrupts, such as NMI on x86) can interrupt control flow.
> 
> Dave
> 

Thanks! I already realized it, it's worth to put it in locking(9).