[PATCH] powerpc/pseries: Don't attempt to acquire drc during memory hot add for assigned lmbs

[Nathan Fontenot]

On 08/23/2017 12:18 PM, John Allen wrote:
> Check if an LMB is assigned before attempting to call dlpar_acquire_drc in
> order to avoid any unnecessary rtas calls. This substantially reduces the
> running time of memory hot add on lpars with large amounts of memory.
> 
> Signed-off-by: John Allen <jallen at linux.vnet.ibm.com>
> ---
> diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
> index ca9b2f4..95cf2ff 100644
> --- a/arch/powerpc/platforms/pseries/hotplug-memory.c
> +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
> @@ -817,6 +817,9 @@ static int dlpar_memory_add_by_count(u32 lmbs_to_add, struct property *prop)
>  		return -EINVAL;
> 
>  	for (i = 0; i < num_lmbs && lmbs_to_add != lmbs_added; i++) {
> +		if (lmbs[i].flags & DRCONF_MEM_ASSIGNED)
> +			continue;
> +

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

>  		rc = dlpar_acquire_drc(lmbs[i].drc_index);
>  		if (rc)
>  			continue;
>