Merge branch 'acpi-hotplug'

* acpi-hotplug:
  ACPI: Do not use CONFIG_ACPI_HOTPLUG_MEMORY_MODULE
  ACPI / cpufreq: Add ACPI processor device IDs to acpi-cpufreq
  Memory hotplug: Move alternative function definitions to header
  ACPI / processor: Fix potential NULL pointer dereference in acpi_processor_add()
  Memory hotplug / ACPI: Simplify memory removal
  ACPI / scan: Add second pass of companion offlining to hot-remove code
  Driver core / MM: Drop offline_memory_block()
  ACPI / processor: Pass processor object handle to acpi_bind_one()
  ACPI: Drop removal_type field from struct acpi_device
  Driver core / memory: Simplify __memory_block_change_state()
  ACPI / processor: Initialize per_cpu(processors, pr->id) properly
  CPU: Fix sysfs cpu/online of offlined CPUs
  Driver core: Introduce offline/online callbacks for memory blocks
  ACPI / memhotplug: Bind removable memory blocks to ACPI device nodes
  ACPI / processor: Use common hotplug infrastructure
  ACPI / hotplug: Use device offline/online for graceful hot-removal
  Driver core: Use generic offline/online for CPU offline/online
  Driver core: Add offline/online device operations

5 files changed, 40 insertions, 12 deletions

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index c13c919..cf0817a 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -63,13 +63,6 @@ acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld
 #define ACPI_BUS_FILE_ROOT	"acpi"
 extern struct proc_dir_entry *acpi_root_dir;
 
-enum acpi_bus_removal_type {
-	ACPI_BUS_REMOVAL_NORMAL = 0,
-	ACPI_BUS_REMOVAL_EJECT,
-	ACPI_BUS_REMOVAL_SUPRISE,
-	ACPI_BUS_REMOVAL_TYPE_COUNT
-};
-
 enum acpi_bus_device_type {
 	ACPI_BUS_TYPE_DEVICE = 0,
 	ACPI_BUS_TYPE_POWER,
@@ -286,6 +279,7 @@ struct acpi_device_physical_node {
 	u8 node_id;
 	struct list_head node;
 	struct device *dev;
+	bool put_online:1;
 };
 
 /* set maximum of physical nodes to 32 for expansibility */
@@ -310,7 +304,6 @@ struct acpi_device {
 	struct acpi_driver *driver;
 	void *driver_data;
 	struct device dev;
-	enum acpi_bus_removal_type removal_type;	/* indicate for different removal type */
 	u8 physical_node_count;
 	struct list_head physical_node_list;
 	struct mutex physical_node_lock;
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index ea69367..66096d0 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -6,6 +6,10 @@
 #include <linux/thermal.h>
 #include <asm/acpi.h>
 
+#define ACPI_PROCESSOR_CLASS		"processor"
+#define ACPI_PROCESSOR_DEVICE_NAME	"Processor"
+#define ACPI_PROCESSOR_DEVICE_HID	"ACPI0007"
+
 #define ACPI_PROCESSOR_BUSY_METRIC	10
 
 #define ACPI_PROCESSOR_MAX_POWER	8
@@ -207,6 +211,7 @@ struct acpi_processor {
 	struct acpi_processor_throttling throttling;
 	struct acpi_processor_limit limit;
 	struct thermal_cooling_device *cdev;
+	struct device *dev; /* Processor device. */
 };
 
 struct acpi_processor_errata {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 17b5b59..353ba25 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -352,8 +352,7 @@ extern acpi_status acpi_pci_osc_control_set(acpi_handle handle,
 
 /* Enable _OST when all relevant hotplug operations are enabled */
 #if defined(CONFIG_ACPI_HOTPLUG_CPU) &&			\
-	(defined(CONFIG_ACPI_HOTPLUG_MEMORY) ||		\
-	 defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE)) &&	\
+	defined(CONFIG_ACPI_HOTPLUG_MEMORY) &&		\
 	defined(CONFIG_ACPI_CONTAINER)
 #define ACPI_HOTPLUG_OST
 #endif
diff --git a/include/linux/device.h b/include/linux/device.h
index c0a1261..eeb3331 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -71,6 +71,10 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  *		the specific driver's probe to initial the matched device.
  * @remove:	Called when a device removed from this bus.
  * @shutdown:	Called at shut-down time to quiesce the device.
+ *
+ * @online:	Called to put the device back online (after offlining it).
+ * @offline:	Called to put the device offline for hot-removal. May fail.
+ *
  * @suspend:	Called when a device on this bus wants to go to sleep mode.
  * @resume:	Called to bring a device on this bus out of sleep mode.
  * @pm:		Power management operations of this bus, callback the specific
@@ -104,6 +108,9 @@ struct bus_type {
 	int (*remove)(struct device *dev);
 	void (*shutdown)(struct device *dev);
 
+	int (*online)(struct device *dev);
+	int (*offline)(struct device *dev);
+
 	int (*suspend)(struct device *dev, pm_message_t state);
 	int (*resume)(struct device *dev);
 
@@ -648,6 +655,8 @@ struct acpi_dev_node {
  * @release:	Callback to free the device after all references have
  * 		gone away. This should be set by the allocator of the
  * 		device (i.e. the bus driver that discovered the device).
+ * @offline_disabled: If set, the device is permanently online.
+ * @offline:	Set after successful invocation of bus type's .offline().
  *
  * At the lowest level, every device in a Linux system is represented by an
  * instance of struct device. The device structure contains the information
@@ -720,6 +729,9 @@ struct device {
 
 	void	(*release)(struct device *dev);
 	struct iommu_group	*iommu_group;
+
+	bool			offline_disabled:1;
+	bool			offline:1;
 };
 
 static inline struct device *kobj_to_dev(struct kobject *kobj)
@@ -856,6 +868,15 @@ extern const char *device_get_devnode(struct device *dev,
 extern void *dev_get_drvdata(const struct device *dev);
 extern int dev_set_drvdata(struct device *dev, void *data);
 
+static inline bool device_supports_offline(struct device *dev)
+{
+	return dev->bus && dev->bus->offline && dev->bus->online;
+}
+
+extern void lock_device_hotplug(void);
+extern void unlock_device_hotplug(void);
+extern int device_offline(struct device *dev);
+extern int device_online(struct device *dev);
 /*
  * Root device objects for grouping under /sys/devices
  */
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 3e622c6..dd38e62 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -234,6 +234,8 @@ static inline void unlock_memory_hotplug(void) {}
 
 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 extern void try_offline_node(int nid);
+extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
+extern void remove_memory(int nid, u64 start, u64 size);
 
 #else
 static inline int is_mem_section_removable(unsigned long pfn,
@@ -243,15 +245,23 @@ static inline int is_mem_section_removable(unsigned long pfn,
 }
 
 static inline void try_offline_node(int nid) {}
+
+static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
+{
+	return -EINVAL;
+}
+
+static inline void remove_memory(int nid, u64 start, u64 size) {}
 #endif /* CONFIG_MEMORY_HOTREMOVE */
 
+extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
+		void *arg, int (*func)(struct memory_block *, void *));
 extern int mem_online_node(int nid);
 extern int add_memory(int nid, u64 start, u64 size);
 extern int arch_add_memory(int nid, u64 start, u64 size);
 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
-extern int offline_memory_block(struct memory_block *mem);
 extern bool is_memblock_offlined(struct memory_block *mem);
-extern int remove_memory(int nid, u64 start, u64 size);
+extern void remove_memory(int nid, u64 start, u64 size);
 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
 								int nr_pages);
 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);