[PATCH] powerpc/pseries: hibernation/migration should honor topology update policy

[Nathan Fontenot]

On 05/05/2015 12:53 PM, Tyrel Datwyler wrote:
> From: Tyrel Datwyler <tyreld at linux.vnet.ibm.com>
> 
> The suspend call paths for hibernation and migration operations call
> stop_topology_update() and start_topology_update() respectively prior to
> suspending the LPAR and upon resume. Topology updating can be
> enabled/disabled from userspace and no check is currently done to determine
> the current policy. This results in topology updates being started upon
> resume from hibernation/migration even in the case where topology updates
> were disabled initially.
> 
> This fixes the issue by storing the current policy and only calling
> start_topology_update() in the case where either PRRN/VPHN were enabled to
> start with.
> 
> Fixes: e04fa61214a3 (powerpc/pseries: Add /proc interface to control topology updates)
> 
> Signed-off-by: Tyrel Datwyler <tyreld at linux.vnet.ibm.com>
> Cc: Nathan Fontenot <nfont at linux.vnet.ibm.com>
> Cc: Nishanth Aravamudan <nacc at linux.vnet.ibm.com>
> Cc: stable at vger.kernel.org

Reviewed-by: Nathan Fontenot <nfont at linux.vnet.ibm.com>