[PATCH] powerpc/pseries: Increase memory block size to 1GB on radix

[Michael Ellerman]

Michael Ellerman <mpe at ellerman.id.au> writes:

> When we're using the Radix MMU we map the kernel linear mapping with
> 1G pages. That means we must do memory hot remove in blocks of at
> least that size. Otherwise the linear mapping can end up not mapping
> all of memory because we've removed part of a 1G region but unmapped
> the entire 1G region from the linear mapping.
>
> Currently on pseries we consult the device tree to find out the the
> "LMB" (Logical Memory Block) size. This is the unit of memory hotplug
> communicated to us by the hypervisor, but it does not take into
> account anything the kernel has done itself, such as use 1G pages for
> the linear mapping.

This patch failed to survive contact with reality. ie. it doesn't work.

NAK.

cheers