Re: [PATCH 1/1] arm64: mm: add config options for page table configuration

[Catalin Marinas]

On Wed, Dec 07, 2016 at 11:40:00AM -0800, Scott Branden wrote:
> Make MAX_PHYSMEM_BITS and SECTIONS_SIZE_BITS configurable by adding
> config options.
> Default to current settings currently defined in sparesmem.h.
> For systems wishing to save memory the config options can be overridden.
> Example, changing MAX_PHYSMEM_BITS from 48 to 36 at the same time as
> changing SECTION_SIZE_BITS from 30 to 26 frees 13MB of memory.

I'm not keen on such change, it's a big departure from the single Image
aims. I would rather reduce SECTION_SIZE_BITS permanently where
feasible, like in this patch:

http://lkml.kernel.org/r/1465821119-3384-1-git-send-email-jszhang@xxxxxxxxxxx

-- 
Catalin