TASK_SIZE default 0x80000000 ?

[Kumar Gala]

On Oct 7, 2007, at 4:05 PM, Benjamin Herrenschmidt wrote:

>
>> Can you explain (a) further -- I'm assuming the BAT mapping is 1:1
>> for that region?
>>
>> For (b) it looks like:
>> * 40x, 44x, fsl-booke compare against TASK_SIZE in their software
>> handlers.
>> * 8xx still tests 0x80000000
>> * 6xx (603) compares against KERNELBASE
>>
>> It would seem like we should set the default on 8xx & PReP to
>> 0x80000000 and not allow it to be modified since that will break the
>> world and for everything else move it to match KERNELBASE.  Any
>> issues with that?
>
> The proper value is neither :-)
>
> It should be compared against PAGE_OFFSET.

I'll work up a patch to switch us to testing PAGE_OFFSET instead.

- k