pagetables used in interrupt context

[subin gangadharan]

Thanks a ton for all your help.

2012/2/26 弋天 卜 <buyit at live.cn>:
> Hi:
>
>   I think it is for safe,people can open interrupt inside their own interrupt handler, so kernel must disable it before touch kernel data that must be protected.
>
>
> 在 2012-2-25，1:39，"subin gangadharan" <subingangadharan at gmail.com> 写道：
>
>> Hi 卜弋天,
>>
>>> 2.6.35, i checked the function handle_level_irq()and handle_edge_irq() in
>>> chip.c, both of them will call handle_IRQ_event() which is in handle.c. and
>>> the function handle_IRQ_event() will call the interrupt handler written by
>>> user. Kernel does not open interrupt(ARM CPSR I bit)when calling interrupt
>>> handler in handle_IRQ_event() function.
>>
>> Thank you for the valuable pointers. I have looked at the
>> handle_IRQ_event function, it seems at the end of the do while loop
>> its unconditionally disable the local interrupt (ARM CPSR I bit). If
>> the handler is running with interrupts disabled, why do we need to
>> disable the interrupts again.
>>
>> Could you please explain about this logic.
>>
>> Thanks in advance for your help and sorry to take up your time on this.
>>
>>
>>
>> --
>> With Regards
>> Subin Gangadharan
>>
>> I am not afraid and I am also not afraid of being afraid.



-- 
With Regards
Subin Gangadharan

I am not afraid and I am also not afraid of being afraid.