powerpc/powernv: Increase memory block size to 1GB on radix

[Michael Ellerman]

On Thu, 2017-09-07 at 05:05:51 UTC, Anton Blanchard wrote:
> From: Anton Blanchard <anton at samba.org>
> 
> Memory hot unplug on PowerNV radix hosts is broken. Our memory block
> size is 256MB but since we map the linear region with very large pages,
> each pte we tear down maps 1GB.
> 
> A hot unplug of one 256MB memory block results in 768MB of memory
> getting unintentionally unmapped. At this point we are likely to oops.
> 
> Fix this by increasing our memory block size to 1GB on PowerNV radix
> hosts.
> 
> Signed-off-by: Anton Blanchard <anton at samba.org>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/53ecde0b9126ff140abe3aefd7f0ec

cheers