[PATCH v2] powerpc: drmem: avoid NULL pointer dereference when drmem is unavailable

[Nathan Lynch]

Michal Suchanek <msuchanek at suse.de> writes:
> From: Libor Pechacek <lpechacek at suse.cz>
>
> In guests without hotplugagble memory drmem structure is only zero
> initialized. Trying to manipulate DLPAR parameters results in a crash.
>

[...]

>
> Fixes: 6c6ea53725b3 ("powerpc/mm: Separate ibm, dynamic-memory data from DT format")
> Cc: Michal Suchanek <msuchanek at suse.cz>
> Cc: stable at vger.kernel.org
> Signed-off-by: Libor Pechacek <lpechacek at suse.cz>
> Signed-off-by: Michal Suchanek <msuchanek at suse.de>
> ---
> v2: rename last_lmb -> limit, clarify error condition.

Acked-by: Nathan Lynch <nathanl at linux.ibm.com>

Thanks!