Re: 85xx Address space query

[kernel mailz <kernelmailz@googlemail.com>]

If an aap has to be placed in AS=1 and it issues an ioctl, kernel
needs to be modified ?
I guess the PID=0 trick will work when AS is same

right ?



On 6/25/09, Kumar Gala <galak@kernel.crashing.org> wrote:
> That is correct.  The PID = 0 translations are always valid.
>
> - k
>
> On Jun 25, 2009, at 5:51 AM, kernel mailz wrote:
>
>> So this means
>> when kernel gets interrupted by app which may be in PID=5 (say)
>> kernel translations for PID=0 remain valid ?
>> I am not able to follow Scott
>>
>> -TZ
>>
>> On Thu, Jun 25, 2009 at 4:22 AM, Scott Wood<scottwood@freescale.com>
>> wrote:
>>> kernel mailz wrote:
>>>>
>>>> But If the app was running with PID=1, interrupt occurs, kernel code
>>>> gets executed in PID=1, how does the kernel handle this ? and goes
>>>> back to PID=0, since its translations are all in PID=0
>>>
>>> PID 0 is special, it's mappings are present regardless of the value
>>> of the
>>> PID register.
>>>
>>> -Scott
>>>
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>