Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6:
  PPC: Fix powerpc vio_find_name to not use devices_subsys
  Driver core: add bus_find_device_by_name function
  Module: check to see if we have a built in module with the same name
  x86: fix runtime error in arch/x86/kernel/cpu/mcheck/mce_amd_64.c
  Driver core: Fix up build when CONFIG_BLOCK=N

arch/powerpc/kernel/vio.c

@@ -37,8 +37,6 @@
 #include <asm/iseries/hv_call_xm.h>
 #include <asm/iseries/iommu.h>
 
-extern struct kset devices_subsys; /* needed for vio_find_name() */
-
 static struct bus_type vio_bus_type;
 
 static struct vio_dev vio_bus_device  = { /* fake "parent" device */
@@ -361,19 +359,16 @@ EXPORT_SYMBOL(vio_get_attribute);
 #ifdef CONFIG_PPC_PSERIES
 /* vio_find_name() - internal because only vio.c knows how we formatted the
  * kobject name
- * XXX once vio_bus_type.devices is actually used as a kset in
- * drivers/base/bus.c, this function should be removed in favor of
- * "device_find(kobj_name, &vio_bus_type)"
  */
-static struct vio_dev *vio_find_name(const char *kobj_name)
+static struct vio_dev *vio_find_name(const char *name)
 {
-	struct kobject *found;
+	struct device *found;
 
-	found = kset_find_obj(&devices_subsys, kobj_name);
+	found = bus_find_device_by_name(&vio_bus_type, NULL, name);
 	if (!found)
 		return NULL;
 
-	return to_vio_dev(container_of(found, struct device, kobj));
+	return to_vio_dev(found);
 }
 
 /**

drivers/base/bus.c

@@ -163,23 +163,14 @@ static struct kset *bus_kset;
 
 #ifdef CONFIG_HOTPLUG
 /* Manually detach a device from its associated driver. */
-static int driver_helper(struct device *dev, void *data)
-{
-	const char *name = data;
-
-	if (strcmp(name, dev->bus_id) == 0)
-		return 1;
-	return 0;
-}
-
 static ssize_t driver_unbind(struct device_driver *drv,
 			     const char *buf, size_t count)
 {
 	struct bus_type *bus = bus_get(drv->bus);
 	struct device *dev;
 	int err = -ENODEV;
 
-	dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
+	dev = bus_find_device_by_name(bus, NULL, buf);
 	if (dev && dev->driver == drv) {
 		if (dev->parent)	/* Needed for USB */
 			down(&dev->parent->sem);
@@ -206,7 +197,7 @@ static ssize_t driver_bind(struct device_driver *drv,
 	struct device *dev;
 	int err = -ENODEV;
 
-	dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
+	dev = bus_find_device_by_name(bus, NULL, buf);
 	if (dev && dev->driver == NULL) {
 		if (dev->parent)	/* Needed for USB */
 			down(&dev->parent->sem);
@@ -250,7 +241,7 @@ static ssize_t store_drivers_probe(struct bus_type *bus,
 {
 	struct device *dev;
 
-	dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
+	dev = bus_find_device_by_name(bus, NULL, buf);
 	if (!dev)
 		return -ENODEV;
 	if (bus_rescan_devices_helper(dev, NULL) != 0)
@@ -338,6 +329,32 @@ struct device *bus_find_device(struct bus_type *bus,
 }
 EXPORT_SYMBOL_GPL(bus_find_device);
 
+static int match_name(struct device *dev, void *data)
+{
+	const char *name = data;
+
+	if (strcmp(name, dev->bus_id) == 0)
+		return 1;
+	return 0;
+}
+
+/**
+ * bus_find_device_by_name - device iterator for locating a particular device of a specific name
+ * @bus: bus type
+ * @start: Device to begin with
+ * @name: name of the device to match
+ *
+ * This is similar to the bus_find_device() function above, but it handles
+ * searching by a name automatically, no need to write another strcmp matching
+ * function.
+ */
+struct device *bus_find_device_by_name(struct bus_type *bus,
+				       struct device *start, const char *name)
+{
+	return bus_find_device(bus, start, (void *)name, match_name);
+}
+EXPORT_SYMBOL_GPL(bus_find_device_by_name);
+
 static struct device_driver *next_driver(struct klist_iter *i)
 {
 	struct klist_node *n = klist_next(i);

drivers/base/class.c

@@ -149,7 +149,7 @@ int class_register(struct class *cls)
 	if (error)
 		return error;
 
-#ifdef CONFIG_SYSFS_DEPRECATED
+#if defined(CONFIG_SYSFS_DEPRECATED) && defined(CONFIG_BLOCK)
 	/* let the block class directory show up in the root of sysfs */
 	if (cls != &block_class)
 		cls->subsys.kobj.kset = class_kset;

drivers/base/core.c

@@ -27,9 +27,17 @@
 int (*platform_notify)(struct device *dev) = NULL;
 int (*platform_notify_remove)(struct device *dev) = NULL;
 
-/*
- * sysfs bindings for devices.
- */
+#ifdef CONFIG_BLOCK
+static inline int device_is_not_partition(struct device *dev)
+{
+	return !(dev->type == &part_type);
+}
+#else
+static inline int device_is_not_partition(struct device *dev)
+{
+	return 1;
+}
+#endif
 
 /**
  * dev_driver_string - Return a device's driver name, if at all possible
@@ -652,14 +660,14 @@ static int device_add_class_symlinks(struct device *dev)
 #ifdef CONFIG_SYSFS_DEPRECATED
 	/* stacked class devices need a symlink in the class directory */
 	if (dev->kobj.parent != &dev->class->subsys.kobj &&
-	    dev->type != &part_type) {
+	    device_is_not_partition(dev)) {
 		error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj,
 					  dev->bus_id);
 		if (error)
 			goto out_subsys;
 	}
 
-	if (dev->parent && dev->type != &part_type) {
+	if (dev->parent && device_is_not_partition(dev)) {
 		struct device *parent = dev->parent;
 		char *class_name;
 
@@ -688,11 +696,11 @@ static int device_add_class_symlinks(struct device *dev)
 	return 0;
 
 out_device:
-	if (dev->parent && dev->type != &part_type)
+	if (dev->parent && device_is_not_partition(dev))
 		sysfs_remove_link(&dev->kobj, "device");
 out_busid:
 	if (dev->kobj.parent != &dev->class->subsys.kobj &&
-	    dev->type != &part_type)
+	    device_is_not_partition(dev))
 		sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
 #else
 	/* link in the class directory pointing to the device */
@@ -701,7 +709,7 @@ static int device_add_class_symlinks(struct device *dev)
 	if (error)
 		goto out_subsys;
 
-	if (dev->parent && dev->type != &part_type) {
+	if (dev->parent && device_is_not_partition(dev)) {
 		error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
 					  "device");
 		if (error)
@@ -725,7 +733,7 @@ static void device_remove_class_symlinks(struct device *dev)
 		return;
 
 #ifdef CONFIG_SYSFS_DEPRECATED
-	if (dev->parent && dev->type != &part_type) {
+	if (dev->parent && device_is_not_partition(dev)) {
 		char *class_name;
 
 		class_name = make_class_name(dev->class->name, &dev->kobj);
@@ -737,10 +745,10 @@ static void device_remove_class_symlinks(struct device *dev)
 	}
 
 	if (dev->kobj.parent != &dev->class->subsys.kobj &&
-	    dev->type != &part_type)
+	    device_is_not_partition(dev))
 		sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
 #else
-	if (dev->parent && dev->type != &part_type)
+	if (dev->parent && device_is_not_partition(dev))
 		sysfs_remove_link(&dev->kobj, "device");
 
 	sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);

include/linux/device.h

@@ -84,6 +84,9 @@ int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
 struct device *bus_find_device(struct bus_type *bus, struct device *start,
 			       void *data,
 			       int (*match)(struct device *dev, void *data));
+struct device *bus_find_device_by_name(struct bus_type *bus,
+				       struct device *start,
+				       const char *name);
 
 int __must_check bus_for_each_drv(struct bus_type *bus,
 				  struct device_driver *start, void *data,