[PATCH 1/3] powerpc/mm/book3s64: Make KERN_IO_START a variable

[Balbir Singh]

On Tue, Aug 1, 2017 at 8:29 PM, Michael Ellerman <mpe at ellerman.id.au> wrote:
> Currently KERN_IO_START is defined as:
>
>  #define KERN_IO_START  (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
>
> Although it looks like a constant, both the components are actually
> variables, to allow us to have a different value between Radix and
> Hash with a single kernel.
>
> However that still requires both Radix and Hash to place the kernel IO
> region at the same location relative to the start and end of the
> kernel virtual region (namely 1/2 way through it), and we'd like to
> change that.
>
> So split KERN_IO_START out into its own variable, and initialise it
> for Radix and Hash. In the medium term we should be able to
> reconsolidate this, by doing a more involved rearrangement of the
> location of the regions.
>
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> ---

Makes sense

Acked-by: Balbir Singh <bsingharora at gmail.com>