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

[Rick Lindsley <ricklind@linux.vnet.ibm.com>]

On 04/13/2017 12:33 PM, Aneesh Kumar K.V wrote:

> I missed this part earlier. I guess that should be fixed in radix code.
> This came in via fbfef9027c2a7ad9277755509fdb849dbccfe8c1 (powerpc/mm:
> Switch some TASK_SIZE checks to use mm_context addr_limit). That patch
> needs update. When we switched from mm->task_size to
> mm->context.addr_limit in latest version of the patch, we missed
> updating the above correctly. I have now send a version  which should
> update this correctly.

Ok - so the intent then is that you may extend your address space, but
you still may not allocate anything larger than task_size (which will
never be larger than 128TB)?  The section we are talking about is checking
the length of the request against task_size, so that means we may not
allocate a single vm area larger than 128TB even though it would be okay
to (say) allocate 3 of those within 512TB of address space?

Rick