driver core: Introduce find_memory_block_hinted which utilizes kset_find_obj_hinted.

Introduce a find_memory_block_hinted() which utilizes the
recently added kset_find_obj_hinted().
Signed-off-by: Robin Holt <holt@sgi.com>
To: Dave Hansen <haveblue@us.ibm.com>
To: Matt Tolentino <matthew.e.tolentino@intel.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/memory.c

@@ -468,28 +468,23 @@ static int add_memory_block(int nid, struct mem_section *section,
 	return ret;
 }
 
-/*
- * For now, we have a linear search to go find the appropriate
- * memory_block corresponding to a particular phys_index. If
- * this gets to be a real problem, we can always use a radix
- * tree or something here.
- *
- * This could be made generic for all sysdev classes.
- */
-struct memory_block *find_memory_block(struct mem_section *section)
+struct memory_block *find_memory_block_hinted(struct mem_section *section,
+					      struct memory_block *hint)
 {
 	struct kobject *kobj;
 	struct sys_device *sysdev;
 	struct memory_block *mem;
 	char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1];
 
+	kobj = hint ? &hint->sysdev.kobj : NULL;
+
 	/*
 	 * This only works because we know that section == sysdev->id
 	 * slightly redundant with sysdev_register()
 	 */
 	sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section));
 
-	kobj = kset_find_obj(&memory_sysdev_class.kset, name);
+	kobj = kset_find_obj_hinted(&memory_sysdev_class.kset, name, kobj);
 	if (!kobj)
 		return NULL;
 
@@ -499,6 +494,19 @@ struct memory_block *find_memory_block(struct mem_section *section)
 	return mem;
 }
 
+/*
+ * For now, we have a linear search to go find the appropriate
+ * memory_block corresponding to a particular phys_index. If
+ * this gets to be a real problem, we can always use a radix
+ * tree or something here.
+ *
+ * This could be made generic for all sysdev classes.
+ */
+struct memory_block *find_memory_block(struct mem_section *section)
+{
+	return find_memory_block_hinted(section, NULL);
+}
+
 int remove_memory_block(unsigned long node_id, struct mem_section *section,
 		int phys_device)
 {

include/linux/memory.h

@@ -113,6 +113,8 @@ extern int memory_dev_init(void);
 extern int remove_memory_block(unsigned long, struct mem_section *, int);
 extern int memory_notify(unsigned long val, void *v);
 extern int memory_isolate_notify(unsigned long val, void *v);
+extern struct memory_block *find_memory_block_hinted(struct mem_section *,
+							struct memory_block *);
 extern struct memory_block *find_memory_block(struct mem_section *);
 #define CONFIG_MEM_BLOCK_SIZE	(PAGES_PER_SECTION<<PAGE_SHIFT)
 enum mem_add_context { BOOT, HOTPLUG };