Can not free irq 0

[Parmenides]

> are you really sure? in my system (laptop with core duo cpu) it is
> increased by around 1000-2000 every 2 seconds and AFAIK it is using
> HPET.
>
Yes. How can I see the timer is i8253 or HPET? I just found 'timer' in
terms of the output of 'cat /proc/interrupts'.


> So maybe IMO free_irq() is causing your cpu referencing null
> instruction...that might be due to free_irq is not checking whether it
> is safe to delete a handler....
>
After enabling the RTC support, I have recompiled the kernel and try
to use the irq 8. But, it seems that the 'irq_request()' can not
register my hangler.


2011/8/28 Mulyadi Santosa <mulyadi.santosa at gmail.com>:
> Hi...
>
> On Sat, Aug 27, 2011 at 22:23, Parmenides <mobile.parmenides at gmail.com> wrote:
>>    I wonder how an interrupt handler work, and so try to make one by
>> myself. The first problem is which irq number should I select to hook
>> an interrupt handler on it. In terms of the following messages, I
>> think irq 0 can be adopted because the number of interrupts raised
>> remains 145 and does not increase any more.
>
> are you really sure? in my system (laptop with core duo cpu) it is
> increased by around 1000-2000 every 2 seconds and AFAIK it is using
> HPET.
>
> So maybe IMO free_irq() is causing your cpu referencing null
> instruction...that might be due to free_irq is not checking whether it
> is safe to delete a handler....
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>