[PATCH] arch/powerpc/mm/slice: Cleanup leftover use of task_size

[Rick Lindsley]

On 04/13/2017 03:58 AM, Aneesh Kumar K.V wrote:

> I would suggest we don't do this change now. But rather we audit the
> usage of TASK_SIZE(), mm->task_size and move them correctly to
> mm->task_size and mm->context.addr_limit. The context.addr_limit is
> added as an optimization for slice_mask copy and we need to closely
> audit to make sure we can use that as a boundary condition for error
> checking in case of mmap.

I do agree that extending the address space could affect other
code because of the use of TASK_SIZE. and we need to examine
"the big picture" to resolve the usage of addr_limit, task_size,
and TASK_SIZE. But without this small change now, I don't see how
the extended address space is made available at all in the non-radix
case. Are we acknowledging that 512TB address space is only available
when radix is enabled?

Rick