driver core: try parent numa_node at first before using default

in the device_add, we try to use use parent numa_node.
need to make sure pci root bus's bridge device numa_node is set.
then we could use device->numa_node direclty for all device.
and don't need to call pcibus_to_node().
Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

drivers/base/core.c

@@ -787,6 +787,10 @@ int device_add(struct device *dev)
 	parent = get_device(dev->parent);
 	setup_parent(dev, parent);
 
+	/* use parent numa_node */
+	if (parent)
+		set_dev_node(dev, dev_to_node(parent));
+
 	/* first, register with generic layer. */
 	error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id);
 	if (error)
@@ -1306,8 +1310,11 @@ int device_move(struct device *dev, struct device *new_parent)
 	dev->parent = new_parent;
 	if (old_parent)
 		klist_remove(&dev->knode_parent);
-	if (new_parent)
+	if (new_parent) {
 		klist_add_tail(&dev->knode_parent, &new_parent->klist_children);
+		set_dev_node(dev, dev_to_node(new_parent));
+	}
+
 	if (!dev->class)
 		goto out_put;
 	error = device_move_class_links(dev, old_parent, new_parent);
@@ -1317,9 +1324,12 @@ int device_move(struct device *dev, struct device *new_parent)
 		if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
 			if (new_parent)
 				klist_remove(&dev->knode_parent);
-			if (old_parent)
+			dev->parent = old_parent;
+			if (old_parent) {
 				klist_add_tail(&dev->knode_parent,
 					       &old_parent->klist_children);
+				set_dev_node(dev, dev_to_node(old_parent));
+			}
 		}
 		cleanup_glue_dir(dev, new_parent_kobj);
 		put_device(new_parent);

drivers/pci/probe.c

@@ -973,7 +973,6 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
 	dev->dev.release = pci_release_dev;
 	pci_dev_get(dev);
 
-	set_dev_node(&dev->dev, pcibus_to_node(bus));
 	dev->dev.dma_mask = &dev->dma_mask;
 	dev->dev.dma_parms = &dev->dma_parms;
 	dev->dev.coherent_dma_mask = 0xffffffffull;
@@ -1128,6 +1127,9 @@ struct pci_bus * pci_create_bus(struct device *parent,
 		goto dev_reg_err;
 	b->bridge = get_device(dev);
 
+	if (!parent)
+		set_dev_node(b->bridge, pcibus_to_node(b));
+
 	b->dev.class = &pcibus_class;
 	b->dev.parent = b->bridge;
 	sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus);