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

[John Allen]

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