Merge tag 'driver-core-5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
"Here is the set of changes for the driver core for 5.17-rc1.

Lots of little things here, including:

- kobj_type cleanups

- auxiliary_bus documentation updates

- auxiliary_device conversions for some drivers (relevant subsystems
all have provided acks for these)

- kernfs lock contention reduction for some workloads

- other tiny cleanups and changes.

All of these have been in linux-next for a while with no reported
issues"

* tag 'driver-core-5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (43 commits)
kobject documentation: remove default_attrs information
drivers/firmware: Add missing platform_device_put() in sysfb_create_simplefb
debugfs: lockdown: Allow reading debugfs files that are not world readable
driver core: Make bus notifiers in right order in really_probe()
driver core: Move driver_sysfs_remove() after driver_sysfs_add()
firmware: edd: remove empty default_attrs array
firmware: dmi-sysfs: use default_groups in kobj_type
qemu_fw_cfg: use default_groups in kobj_type
firmware: memmap: use default_groups in kobj_type
sh: sq: use default_groups in kobj_type
headers/uninline: Uninline single-use function: kobject_has_children()
devtmpfs: mount with noexec and nosuid
driver core: Simplify async probe test code by using ktime_ms_delta()
nilfs2: use default_groups in kobj_type
kobject: remove kset from struct kset_uevent_ops callbacks
driver core: make kobj_type constant.
driver core: platform: document registration-failure requirement
vdpa/mlx5: Use auxiliary_device driver data helpers
net/mlx5e: Use auxiliary_device driver data helpers
soundwire: intel: Use auxiliary_device driver data helpers
...

Documentation/ABI/testing/sysfs-devices-system-cpu

···
 		================  ==============================================
 
 		See also: Documentation/arm64/memory-tagging-extension.rst
+
+What:		/sys/devices/system/cpu/nohz_full
+Date:		Apr 2015
+Contact:	Linux kernel mailing list <[e-mail]>
+Description:
+		(RO) the list of CPUs that are in nohz_full mode.
+		These CPUs are set by boot parameter "nohz_full=".
+
+What:		/sys/devices/system/cpu/isolated
+Date:		Apr 2015
+Contact:	Linux kernel mailing list <[e-mail]>
+Description:
+		(RO) the list of CPUs that are isolated and don't
+		participate in load balancing. These CPUs are set by
+		boot parameter "isolcpus=".

Documentation/admin-guide/cputopology.rst

···
 Documentation/ABI/stable/sysfs-devices-system-cpu.
 
 Architecture-neutral, drivers/base/topology.c, exports these attributes.
-However, the book and drawer related sysfs files will only be created if
-CONFIG_SCHED_BOOK and CONFIG_SCHED_DRAWER are selected, respectively.
-
-CONFIG_SCHED_BOOK and CONFIG_SCHED_DRAWER are currently only used on s390,
-where they reflect the cpu and cache hierarchy.
+However the die, cluster, book, and drawer hierarchy related sysfs files will
+only be created if an architecture provides the related macros as described
+below.
 
 For an architecture to support this feature, it must define some of
 these macros in include/asm-XXX/topology.h::
···
 2) topology_die_id: -1
 3) topology_cluster_id: -1
 4) topology_core_id: 0
-5) topology_sibling_cpumask: just the given CPU
-6) topology_core_cpumask: just the given CPU
-7) topology_cluster_cpumask: just the given CPU
-8) topology_die_cpumask: just the given CPU
-
-For architectures that don't support books (CONFIG_SCHED_BOOK) there are no
-default definitions for topology_book_id() and topology_book_cpumask().
-For architectures that don't support drawers (CONFIG_SCHED_DRAWER) there are
-no default definitions for topology_drawer_id() and topology_drawer_cpumask().
+5) topology_book_id: -1
+6) topology_drawer_id: -1
+7) topology_sibling_cpumask: just the given CPU
+8) topology_core_cpumask: just the given CPU
+9) topology_cluster_cpumask: just the given CPU
+10) topology_die_cpumask: just the given CPU
+11) topology_book_cpumask:  just the given CPU
+12) topology_drawer_cpumask: just the given CPU
 
 Additionally, CPU topology information is provided under
 /sys/devices/system/cpu and includes these files.  The internal

Documentation/core-api/kobject.rst

···
 Code which creates a kobject must, of course, initialize that object. Some
 of the internal fields are setup with a (mandatory) call to kobject_init()::
 
-    void kobject_init(struct kobject *kobj, struct kobj_type *ktype);
+    void kobject_init(struct kobject *kobj, const struct kobj_type *ktype);
 
 The ktype is required for a kobject to be created properly, as every kobject
 must have an associated kobj_type.  After calling kobject_init(), to
···
 There is a helper function to both initialize and add the kobject to the
 kernel at the same time, called surprisingly enough kobject_init_and_add()::
 
-    int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
+    int kobject_init_and_add(struct kobject *kobj, const struct kobj_type *ktype,
                              struct kobject *parent, const char *fmt, ...);
 
 The arguments are the same as the individual kobject_init() and
···
     struct kobj_type {
             void (*release)(struct kobject *kobj);
             const struct sysfs_ops *sysfs_ops;
-            struct attribute **default_attrs;
             const struct attribute_group **default_groups;
             const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj);
             const void *(*namespace)(struct kobject *kobj);
···
 
 The release field in struct kobj_type is, of course, a pointer to the
 release() method for this type of kobject. The other two fields (sysfs_ops
-and default_attrs) control how objects of this type are represented in
+and default_groups) control how objects of this type are represented in
 sysfs; they are beyond the scope of this document.
 
-The default_attrs pointer is a list of default attributes that will be
+The default_groups pointer is a list of default attributes that will be
 automatically created for any kobject that is registered with this ktype.
 
 
···
 associated with it, it can use the struct kset_uevent_ops to handle it::
 
   struct kset_uevent_ops {
-          int (* const filter)(struct kset *kset, struct kobject *kobj);
-          const char *(* const name)(struct kset *kset, struct kobject *kobj);
-          int (* const uevent)(struct kset *kset, struct kobject *kobj,
-                        struct kobj_uevent_env *env);
+          int (* const filter)(struct kobject *kobj);
+          const char *(* const name)(struct kobject *kobj);
+          int (* const uevent)(struct kobject *kobj, struct kobj_uevent_env *env);
   };
 
 

Documentation/driver-api/auxiliary_bus.rst

···
 Auxiliary Bus
 =============
 
-In some subsystems, the functionality of the core device (PCI/ACPI/other) is
-too complex for a single device to be managed by a monolithic driver
-(e.g. Sound Open Firmware), multiple devices might implement a common
-intersection of functionality (e.g. NICs + RDMA), or a driver may want to
-export an interface for another subsystem to drive (e.g. SIOV Physical Function
-export Virtual Function management).  A split of the functionality into child-
-devices representing sub-domains of functionality makes it possible to
-compartmentalize, layer, and distribute domain-specific concerns via a Linux
-device-driver model.
-
-An example for this kind of requirement is the audio subsystem where a single
-IP is handling multiple entities such as HDMI, Soundwire, local devices such as
-mics/speakers etc. The split for the core's functionality can be arbitrary or
-be defined by the DSP firmware topology and include hooks for test/debug. This
-allows for the audio core device to be minimal and focused on hardware-specific
-control and communication.
-
-Each auxiliary_device represents a part of its parent functionality. The
-generic behavior can be extended and specialized as needed by encapsulating an
-auxiliary_device within other domain-specific structures and the use of .ops
-callbacks. Devices on the auxiliary bus do not share any structures and the use
-of a communication channel with the parent is domain-specific.
-
-Note that ops are intended as a way to augment instance behavior within a class
-of auxiliary devices, it is not the mechanism for exporting common
-infrastructure from the parent. Consider EXPORT_SYMBOL_NS() to convey
-infrastructure from the parent module to the auxiliary module(s).
-
+.. kernel-doc:: drivers/base/auxiliary.c
+   :doc: PURPOSE
 
 When Should the Auxiliary Bus Be Used
 =====================================
 
-The auxiliary bus is to be used when a driver and one or more kernel modules,
-who share a common header file with the driver, need a mechanism to connect and
-provide access to a shared object allocated by the auxiliary_device's
-registering driver.  The registering driver for the auxiliary_device(s) and the
-kernel module(s) registering auxiliary_drivers can be from the same subsystem,
-or from multiple subsystems.
+.. kernel-doc:: drivers/base/auxiliary.c
+   :doc: USAGE
 
-The emphasis here is on a common generic interface that keeps subsystem
-customization out of the bus infrastructure.
 
-One example is a PCI network device that is RDMA-capable and exports a child
-device to be driven by an auxiliary_driver in the RDMA subsystem.  The PCI
-driver allocates and registers an auxiliary_device for each physical
-function on the NIC.  The RDMA driver registers an auxiliary_driver that claims
-each of these auxiliary_devices.  This conveys data/ops published by the parent
-PCI device/driver to the RDMA auxiliary_driver.
+Auxiliary Device Creation
+=========================
 
-Another use case is for the PCI device to be split out into multiple sub
-functions.  For each sub function an auxiliary_device is created.  A PCI sub
-function driver binds to such devices that creates its own one or more class
-devices.  A PCI sub function auxiliary device is likely to be contained in a
-struct with additional attributes such as user defined sub function number and
-optional attributes such as resources and a link to the parent device.  These
-attributes could be used by systemd/udev; and hence should be initialized
-before a driver binds to an auxiliary_device.
+.. kernel-doc:: include/linux/auxiliary_bus.h
+   :identifiers: auxiliary_device
 
-A key requirement for utilizing the auxiliary bus is that there is no
-dependency on a physical bus, device, register accesses or regmap support.
-These individual devices split from the core cannot live on the platform bus as
-they are not physical devices that are controlled by DT/ACPI.  The same
-argument applies for not using MFD in this scenario as MFD relies on individual
-function devices being physical devices.
-
-Auxiliary Device
-================
-
-An auxiliary_device represents a part of its parent device's functionality. It
-is given a name that, combined with the registering drivers KBUILD_MODNAME,
-creates a match_name that is used for driver binding, and an id that combined
-with the match_name provide a unique name to register with the bus subsystem.
-
-Registering an auxiliary_device is a two-step process.  First call
-auxiliary_device_init(), which checks several aspects of the auxiliary_device
-struct and performs a device_initialize().  After this step completes, any
-error state must have a call to auxiliary_device_uninit() in its resolution path.
-The second step in registering an auxiliary_device is to perform a call to
-auxiliary_device_add(), which sets the name of the device and add the device to
-the bus.
-
-Unregistering an auxiliary_device is also a two-step process to mirror the
-register process.  First call auxiliary_device_delete(), then call
-auxiliary_device_uninit().
-
-.. code-block:: c
-
-	struct auxiliary_device {
-		struct device dev;
-                const char *name;
-		u32 id;
-	};
-
-If two auxiliary_devices both with a match_name "mod.foo" are registered onto
-the bus, they must have unique id values (e.g. "x" and "y") so that the
-registered devices names are "mod.foo.x" and "mod.foo.y".  If match_name + id
-are not unique, then the device_add fails and generates an error message.
-
-The auxiliary_device.dev.type.release or auxiliary_device.dev.release must be
-populated with a non-NULL pointer to successfully register the auxiliary_device.
-
-The auxiliary_device.dev.parent must also be populated.
+.. kernel-doc:: drivers/base/auxiliary.c
+   :identifiers: auxiliary_device_init __auxiliary_device_add
+                 auxiliary_find_device
 
 Auxiliary Device Memory Model and Lifespan
 ------------------------------------------
 
-The registering driver is the entity that allocates memory for the
-auxiliary_device and register it on the auxiliary bus.  It is important to note
-that, as opposed to the platform bus, the registering driver is wholly
-responsible for the management for the memory used for the driver object.
+.. kernel-doc:: include/linux/auxiliary_bus.h
+   :doc: DEVICE_LIFESPAN
 
-A parent object, defined in the shared header file, contains the
-auxiliary_device.  It also contains a pointer to the shared object(s), which
-also is defined in the shared header.  Both the parent object and the shared
-object(s) are allocated by the registering driver.  This layout allows the
-auxiliary_driver's registering module to perform a container_of() call to go
-from the pointer to the auxiliary_device, that is passed during the call to the
-auxiliary_driver's probe function, up to the parent object, and then have
-access to the shared object(s).
-
-The memory for the auxiliary_device is freed only in its release() callback
-flow as defined by its registering driver.
-
-The memory for the shared object(s) must have a lifespan equal to, or greater
-than, the lifespan of the memory for the auxiliary_device.  The auxiliary_driver
-should only consider that this shared object is valid as long as the
-auxiliary_device is still registered on the auxiliary bus.  It is up to the
-registering driver to manage (e.g. free or keep available) the memory for the
-shared object beyond the life of the auxiliary_device.
-
-The registering driver must unregister all auxiliary devices before its own
-driver.remove() is completed.
 
 Auxiliary Drivers
 =================
 
-Auxiliary drivers follow the standard driver model convention, where
-discovery/enumeration is handled by the core, and drivers
-provide probe() and remove() methods. They support power management
-and shutdown notifications using the standard conventions.
+.. kernel-doc:: include/linux/auxiliary_bus.h
+   :identifiers: auxiliary_driver module_auxiliary_driver
 
-.. code-block:: c
-
-	struct auxiliary_driver {
-		int (*probe)(struct auxiliary_device *,
-                             const struct auxiliary_device_id *id);
-		void (*remove)(struct auxiliary_device *);
-		void (*shutdown)(struct auxiliary_device *);
-		int (*suspend)(struct auxiliary_device *, pm_message_t);
-		int (*resume)(struct auxiliary_device *);
-		struct device_driver driver;
-		const struct auxiliary_device_id *id_table;
-	};
-
-Auxiliary drivers register themselves with the bus by calling
-auxiliary_driver_register(). The id_table contains the match_names of auxiliary
-devices that a driver can bind with.
+.. kernel-doc:: drivers/base/auxiliary.c
+   :identifiers: __auxiliary_driver_register auxiliary_driver_unregister
 
 Example Usage
 =============
 
-Auxiliary devices are created and registered by a subsystem-level core device
-that needs to break up its functionality into smaller fragments. One way to
-extend the scope of an auxiliary_device is to encapsulate it within a domain-
-pecific structure defined by the parent device. This structure contains the
-auxiliary_device and any associated shared data/callbacks needed to establish
-the connection with the parent.
+.. kernel-doc:: drivers/base/auxiliary.c
+   :doc: EXAMPLE
 
-An example is:
-
-.. code-block:: c
-
-        struct foo {
-		struct auxiliary_device auxdev;
-		void (*connect)(struct auxiliary_device *auxdev);
-		void (*disconnect)(struct auxiliary_device *auxdev);
-		void *data;
-        };
-
-The parent device then registers the auxiliary_device by calling
-auxiliary_device_init(), and then auxiliary_device_add(), with the pointer to
-the auxdev member of the above structure. The parent provides a name for the
-auxiliary_device that, combined with the parent's KBUILD_MODNAME, creates a
-match_name that is be used for matching and binding with a driver.
-
-Whenever an auxiliary_driver is registered, based on the match_name, the
-auxiliary_driver's probe() is invoked for the matching devices.  The
-auxiliary_driver can also be encapsulated inside custom drivers that make the
-core device's functionality extensible by adding additional domain-specific ops
-as follows:
-
-.. code-block:: c
-
-	struct my_ops {
-		void (*send)(struct auxiliary_device *auxdev);
-		void (*receive)(struct auxiliary_device *auxdev);
-	};
-
-
-	struct my_driver {
-		struct auxiliary_driver auxiliary_drv;
-		const struct my_ops ops;
-	};
-
-An example of this type of usage is:
-
-.. code-block:: c
-
-	const struct auxiliary_device_id my_auxiliary_id_table[] = {
-		{ .name = "foo_mod.foo_dev" },
-		{ },
-	};
-
-	const struct my_ops my_custom_ops = {
-		.send = my_tx,
-		.receive = my_rx,
-	};
-
-	const struct my_driver my_drv = {
-		.auxiliary_drv = {
-			.name = "myauxiliarydrv",
-			.id_table = my_auxiliary_id_table,
-			.probe = my_probe,
-			.remove = my_remove,
-			.shutdown = my_shutdown,
-		},
-		.ops = my_custom_ops,
-	};

Documentation/translations/zh_CN/core-api/kobject.rst

···
     struct kobj_type {
             void (*release)(struct kobject *kobj);
             const struct sysfs_ops *sysfs_ops;
-            struct attribute **default_attrs;
             const struct attribute_group **default_groups;
             const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj);
             const void *(*namespace)(struct kobject *kobj);
···
 指针。
 
 当然，kobj_type结构中的release字段是指向这种类型的kobject的release()
-方法的一个指针。另外两个字段（sysfs_ops 和 default_attrs）控制这种
+方法的一个指针。另外两个字段（sysfs_ops 和 default_groups）控制这种
 类型的对象如何在 sysfs 中被表示；它们超出了本文的范围。
 
-default_attrs 指针是一个默认属性的列表，它将为任何用这个 ktype 注册
+default_groups 指针是一个默认属性的列表，它将为任何用这个 ktype 注册
 的 kobject 自动创建。
 
 
···
 结构体kset_uevent_ops来处理它::
 
   struct kset_uevent_ops {
-          int (* const filter)(struct kset *kset, struct kobject *kobj);
-          const char *(* const name)(struct kset *kset, struct kobject *kobj);
-          int (* const uevent)(struct kset *kset, struct kobject *kobj,
-                        struct kobj_uevent_env *env);
+          int (* const filter)(struct kobject *kobj);
+          const char *(* const name)(struct kobject *kobj);
+          int (* const uevent)(struct kobject *kobj, struct kobj_uevent_env *env);
   };
 
 

MAINTAINERS

···
 F:	drivers/mfd/intel_soc_pmic*
 F:	include/linux/mfd/intel_soc_pmic*
 
-INTEL PMT DRIVER
-M:	"David E. Box" <[e-mail]>
-S:	Maintained
-F:	drivers/mfd/intel_pmt.c
+INTEL PMT DRIVERS
+M:	David E. Box <[e-mail]>
+S:	Supported
 F:	drivers/platform/x86/intel/pmt/
 
 INTEL PRO/WIRELESS 2100, 2200BG, 2915ABG NETWORK CONNECTION SUPPORT
···
 L:	[e-mail]
 S:	Maintained
 F:	drivers/platform/x86/intel/uncore-frequency.c
+
+INTEL VENDOR SPECIFIC EXTENDED CAPABILITIES DRIVER
+M:	David E. Box <[e-mail]>
+S:	Supported
+F:	drivers/platform/x86/intel/vsec.*
 
 INTEL VIRTUAL BUTTON DRIVER
 M:	AceLan Kao <[e-mail]>

arch/sh/kernel/cpu/sh4/sq.c

···
 	&mapping_attr.attr,
 	NULL,
 };
+ATTRIBUTE_GROUPS(sq_sysfs);
 
 static const struct sysfs_ops sq_sysfs_ops = {
 	.show	= sq_sysfs_show,
···
 
 static struct kobj_type ktype_percpu_entry = {
 	.sysfs_ops	= &sq_sysfs_ops,
-	.default_attrs	= sq_sysfs_attrs,
+	.default_groups	= sq_sysfs_groups,
 };
 
 static int sq_dev_add(struct device *dev, struct subsys_interface *sif)

drivers/base/Kconfig

···
 	  rescue mode with init=/bin/sh, even when the /dev directory
 	  on the rootfs is completely empty.
 
+config DEVTMPFS_SAFE
+	bool "Use nosuid,noexec mount options on devtmpfs"
+	depends on DEVTMPFS
+	help
+	  This instructs the kernel to include the MS_NOEXEC and MS_NOSUID mount
+	  flags when mounting devtmpfs.
+
+	  Notice: If enabled, things like /dev/mem cannot be mmapped
+	  with the PROT_EXEC flag. This can break, for example, non-KMS
+	  video drivers.
+
 config STANDALONE
 	bool "Select only drivers that don't need compile-time external firmware"
 	default y

drivers/base/auxiliary.c

···
 #include <linux/auxiliary_bus.h>
 #include "base.h"
 
+/**
+ * DOC: PURPOSE
+ *
+ * In some subsystems, the functionality of the core device (PCI/ACPI/other) is
+ * too complex for a single device to be managed by a monolithic driver (e.g.
+ * Sound Open Firmware), multiple devices might implement a common intersection
+ * of functionality (e.g. NICs + RDMA), or a driver may want to export an
+ * interface for another subsystem to drive (e.g. SIOV Physical Function export
+ * Virtual Function management).  A split of the functionality into child-
+ * devices representing sub-domains of functionality makes it possible to
+ * compartmentalize, layer, and distribute domain-specific concerns via a Linux
+ * device-driver model.
+ *
+ * An example for this kind of requirement is the audio subsystem where a
+ * single IP is handling multiple entities such as HDMI, Soundwire, local
+ * devices such as mics/speakers etc. The split for the core's functionality
+ * can be arbitrary or be defined by the DSP firmware topology and include
+ * hooks for test/debug. This allows for the audio core device to be minimal
+ * and focused on hardware-specific control and communication.
+ *
+ * Each auxiliary_device represents a part of its parent functionality. The
+ * generic behavior can be extended and specialized as needed by encapsulating
+ * an auxiliary_device within other domain-specific structures and the use of
+ * .ops callbacks. Devices on the auxiliary bus do not share any structures and
+ * the use of a communication channel with the parent is domain-specific.
+ *
+ * Note that ops are intended as a way to augment instance behavior within a
+ * class of auxiliary devices, it is not the mechanism for exporting common
+ * infrastructure from the parent. Consider EXPORT_SYMBOL_NS() to convey
+ * infrastructure from the parent module to the auxiliary module(s).
+ */
+
+/**
+ * DOC: USAGE
+ *
+ * The auxiliary bus is to be used when a driver and one or more kernel
+ * modules, who share a common header file with the driver, need a mechanism to
+ * connect and provide access to a shared object allocated by the
+ * auxiliary_device's registering driver.  The registering driver for the
+ * auxiliary_device(s) and the kernel module(s) registering auxiliary_drivers
+ * can be from the same subsystem, or from multiple subsystems.
+ *
+ * The emphasis here is on a common generic interface that keeps subsystem
+ * customization out of the bus infrastructure.
+ *
+ * One example is a PCI network device that is RDMA-capable and exports a child
+ * device to be driven by an auxiliary_driver in the RDMA subsystem.  The PCI
+ * driver allocates and registers an auxiliary_device for each physical
+ * function on the NIC.  The RDMA driver registers an auxiliary_driver that
+ * claims each of these auxiliary_devices.  This conveys data/ops published by
+ * the parent PCI device/driver to the RDMA auxiliary_driver.
+ *
+ * Another use case is for the PCI device to be split out into multiple sub
+ * functions.  For each sub function an auxiliary_device is created.  A PCI sub
+ * function driver binds to such devices that creates its own one or more class
+ * devices.  A PCI sub function auxiliary device is likely to be contained in a
+ * struct with additional attributes such as user defined sub function number
+ * and optional attributes such as resources and a link to the parent device.
+ * These attributes could be used by systemd/udev; and hence should be
+ * initialized before a driver binds to an auxiliary_device.
+ *
+ * A key requirement for utilizing the auxiliary bus is that there is no
+ * dependency on a physical bus, device, register accesses or regmap support.
+ * These individual devices split from the core cannot live on the platform bus
+ * as they are not physical devices that are controlled by DT/ACPI.  The same
+ * argument applies for not using MFD in this scenario as MFD relies on
+ * individual function devices being physical devices.
+ */
+
+/**
+ * DOC: EXAMPLE
+ *
+ * Auxiliary devices are created and registered by a subsystem-level core
+ * device that needs to break up its functionality into smaller fragments. One
+ * way to extend the scope of an auxiliary_device is to encapsulate it within a
+ * domain- pecific structure defined by the parent device. This structure
+ * contains the auxiliary_device and any associated shared data/callbacks
+ * needed to establish the connection with the parent.
+ *
+ * An example is:
+ *
+ * .. code-block:: c
+ *
+ *         struct foo {
+ *		struct auxiliary_device auxdev;
+ *		void (*connect)(struct auxiliary_device *auxdev);
+ *		void (*disconnect)(struct auxiliary_device *auxdev);
+ *		void *data;
+ *        };
+ *
+ * The parent device then registers the auxiliary_device by calling
+ * auxiliary_device_init(), and then auxiliary_device_add(), with the pointer
+ * to the auxdev member of the above structure. The parent provides a name for
+ * the auxiliary_device that, combined with the parent's KBUILD_MODNAME,
+ * creates a match_name that is be used for matching and binding with a driver.
+ *
+ * Whenever an auxiliary_driver is registered, based on the match_name, the
+ * auxiliary_driver's probe() is invoked for the matching devices.  The
+ * auxiliary_driver can also be encapsulated inside custom drivers that make
+ * the core device's functionality extensible by adding additional
+ * domain-specific ops as follows:
+ *
+ * .. code-block:: c
+ *
+ *	struct my_ops {
+ *		void (*send)(struct auxiliary_device *auxdev);
+ *		void (*receive)(struct auxiliary_device *auxdev);
+ *	};
+ *
+ *
+ *	struct my_driver {
+ *		struct auxiliary_driver auxiliary_drv;
+ *		const struct my_ops ops;
+ *	};
+ *
+ * An example of this type of usage is:
+ *
+ * .. code-block:: c
+ *
+ *	const struct auxiliary_device_id my_auxiliary_id_table[] = {
+ *		{ .name = "foo_mod.foo_dev" },
+ *		{ },
+ *	};
+ *
+ *	const struct my_ops my_custom_ops = {
+ *		.send = my_tx,
+ *		.receive = my_rx,
+ *	};
+ *
+ *	const struct my_driver my_drv = {
+ *		.auxiliary_drv = {
+ *			.name = "myauxiliarydrv",
+ *			.id_table = my_auxiliary_id_table,
+ *			.probe = my_probe,
+ *			.remove = my_remove,
+ *			.shutdown = my_shutdown,
+ *		},
+ *		.ops = my_custom_ops,
+ *	};
+ */
+
 static const struct auxiliary_device_id *auxiliary_match_id(const struct auxiliary_device_id *id,
 							    const struct auxiliary_device *auxdev)
 {
···
  * auxiliary_device_init - check auxiliary_device and initialize
  * @auxdev: auxiliary device struct
  *
- * This is the first step in the two-step process to register an
+ * This is the second step in the three-step process to register an
  * auxiliary_device.
  *
  * When this function returns an error code, then the device_initialize will
···
  * @auxdev: auxiliary bus device to add to the bus
  * @modname: name of the parent device's driver module
  *
- * This is the second step in the two-step process to register an
+ * This is the third step in the three-step process to register an
  * auxiliary_device.
  *
  * This function must be called after a successful call to
···
  * This function returns a reference to a device that is 'found'
  * for later use, as determined by the @match callback.
  *
+ * The reference returned should be released with put_device().
+ *
  * The callback should return 0 if the device doesn't match and non-zero
  * if it does.  If the callback returns non-zero, this function will
  * return to the caller and not iterate over any more devices.
···
  * @auxdrv: auxiliary_driver structure
  * @owner: owning module/driver
  * @modname: KBUILD_MODNAME for parent driver
+ *
+ * The expectation is that users will call the "auxiliary_driver_register"
+ * macro so that the caller's KBUILD_MODNAME is automatically inserted for the
+ * modname parameter.  Only if a user requires a custom name would this version
+ * be called directly.
  */
 int __auxiliary_driver_register(struct auxiliary_driver *auxdrv,
 				struct module *owner, const char *modname)

drivers/base/bus.c

···
 	.release	= bus_release,
 };
 
-static int bus_uevent_filter(struct kset *kset, struct kobject *kobj)
+static int bus_uevent_filter(struct kobject *kobj)
 {
-	struct kobj_type *ktype = get_ktype(kobj);
+	const struct kobj_type *ktype = get_ktype(kobj);
 
 	if (ktype == &bus_ktype)
 		return 1;

drivers/base/core.c

···
 };
 
 
-static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
+static int dev_uevent_filter(struct kobject *kobj)
 {
-	struct kobj_type *ktype = get_ktype(kobj);
+	const struct kobj_type *ktype = get_ktype(kobj);
 
 	if (ktype == &device_ktype) {
 		struct device *dev = kobj_to_dev(kobj);
···
 	return 0;
 }
 
-static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
+static const char *dev_uevent_name(struct kobject *kobj)
 {
 	struct device *dev = kobj_to_dev(kobj);
 
···
 	return NULL;
 }
 
-static int dev_uevent(struct kset *kset, struct kobject *kobj,
-		      struct kobj_uevent_env *env)
+static int dev_uevent(struct kobject *kobj, struct kobj_uevent_env *env)
 {
 	struct device *dev = kobj_to_dev(kobj);
 	int retval = 0;
···
 
 	/* respect filter */
 	if (kset->uevent_ops && kset->uevent_ops->filter)
-		if (!kset->uevent_ops->filter(kset, &dev->kobj))
+		if (!kset->uevent_ops->filter(&dev->kobj))
 			goto out;
 
 	env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
···
 		return -ENOMEM;
 
 	/* let the kset specific function add its keys */
-	retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
+	retval = kset->uevent_ops->uevent(&dev->kobj, env);
 	if (retval)
 		goto out;
 
···
 static inline struct kobject *get_glue_dir(struct device *dev)
 {
 	return dev->kobj.parent;
+}
+
+/**
+ * kobject_has_children - Returns whether a kobject has children.
+ * @kobj: the object to test
+ *
+ * This will return whether a kobject has other kobjects as children.
+ *
+ * It does NOT account for the presence of attribute files, only sub
+ * directories. It also assumes there is no concurrent addition or
+ * removal of such children, and thus relies on external locking.
+ */
+static inline bool kobject_has_children(struct kobject *kobj)
+{
+	WARN_ON_ONCE(kref_read(&kobj->kref) == 0);
+
+	return kobj->sd && kobj->sd->dir.subdirs;
 }
 
 /*

drivers/base/dd.c

···
 	if (dev->bus->dma_configure) {
 		ret = dev->bus->dma_configure(dev);
 		if (ret)
-			goto probe_failed;
+			goto pinctrl_bind_failed;
 	}
 
 	ret = driver_sysfs_add(dev);
 	if (ret) {
 		pr_err("%s: driver_sysfs_add(%s) failed\n",
 		       __func__, dev_name(dev));
-		goto probe_failed;
+		goto sysfs_failed;
 	}
 
 	if (dev->pm_domain && dev->pm_domain->activate) {
···
 	else if (drv->remove)
 		drv->remove(dev);
 probe_failed:
+	driver_sysfs_remove(dev);
+sysfs_failed:
 	if (dev->bus)
 		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 					     BUS_NOTIFY_DRIVER_NOT_BOUND, dev);
···
 	arch_teardown_dma_ops(dev);
 	kfree(dev->dma_range_map);
 	dev->dma_range_map = NULL;
-	driver_sysfs_remove(dev);
 	dev->driver = NULL;
 	dev_set_drvdata(dev, NULL);
 	if (dev->pm_domain && dev->pm_domain->dismiss)

drivers/base/devtmpfs.c

···
 #include <uapi/linux/mount.h>
 #include "base.h"
 
+#ifdef CONFIG_DEVTMPFS_SAFE
+#define DEVTMPFS_MFLAGS       (MS_SILENT | MS_NOEXEC | MS_NOSUID)
+#else
+#define DEVTMPFS_MFLAGS       (MS_SILENT)
+#endif
+
 static struct task_struct *thread;
 
 static int __initdata mount_dev = IS_ENABLED(CONFIG_DEVTMPFS_MOUNT);
···
 	if (!thread)
 		return 0;
 
-	err = init_mount("devtmpfs", "dev", "devtmpfs", MS_SILENT, NULL);
+	err = init_mount("devtmpfs", "dev", "devtmpfs", DEVTMPFS_MFLAGS, NULL);
 	if (err)
 		printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
 	else
···
 	err = ksys_unshare(CLONE_NEWNS);
 	if (err)
 		goto out;
-	err = init_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, NULL);
+	err = init_mount("devtmpfs", "/", "devtmpfs", DEVTMPFS_MFLAGS, NULL);
 	if (err)
 		goto out;
 	init_chdir("/.."); /* will traverse into overmounted root */

drivers/base/platform.c

···
 	int ret;
 
 	ret = platform_get_irq_optional(dev, num);
-	if (ret < 0 && ret != -EPROBE_DEFER)
-		dev_err(&dev->dev, "IRQ index %u not found\n", num);
+	if (ret < 0)
+		return dev_err_probe(&dev->dev, ret,
+				     "IRQ index %u not found\n", num);
 
 	return ret;
 }
···
 /**
  * platform_device_register - add a platform-level device
  * @pdev: platform device we're adding
+ *
+ * NOTE: _Never_ directly free @pdev after calling this function, even if it
+ * returned an error! Always use platform_device_put() to give up the
+ * reference initialised in this function instead.
  */
 int platform_device_register(struct platform_device *pdev)
 {

drivers/base/property.c

···
 				       unsigned int nargs, unsigned int index,
 				       struct fwnode_reference_args *args)
 {
-	return fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
-				  nargs, index, args);
+	int ret;
+
+	ret = fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
+				 nargs, index, args);
+
+	if (ret < 0 && !IS_ERR_OR_NULL(fwnode) &&
+	    !IS_ERR_OR_NULL(fwnode->secondary))
+		ret = fwnode_call_int_op(fwnode->secondary, get_reference_args,
+					 prop, nargs_prop, nargs, index, args);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
 

drivers/base/test/test_async_driver_probe.c

···
 	struct platform_device **pdev = NULL;
 	int async_id = 0, sync_id = 0;
 	unsigned long long duration;
-	ktime_t calltime, delta;
+	ktime_t calltime;
 	int err, nid, cpu;
 
 	pr_info("registering first set of asynchronous devices...\n");
···
 		goto err_unregister_async_devs;
 	}
 
-	delta = ktime_sub(ktime_get(), calltime);
-	duration = (unsigned long long) ktime_to_ms(delta);
+	duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
 	pr_info("registration took %lld msecs\n", duration);
 	if (duration > TEST_PROBE_THRESHOLD) {
 		pr_err("test failed: probe took too long\n");
···
 		async_id++;
 	}
 
-	delta = ktime_sub(ktime_get(), calltime);
-	duration = (unsigned long long) ktime_to_ms(delta);
+	duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
 	dev_info(&(*pdev)->dev,
 		 "registration took %lld msecs\n", duration);
 	if (duration > TEST_PROBE_THRESHOLD) {
···
 		goto err_unregister_sync_devs;
 	}
 
-	delta = ktime_sub(ktime_get(), calltime);
-	duration = (unsigned long long) ktime_to_ms(delta);
+	duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
 	pr_info("registration took %lld msecs\n", duration);
 	if (duration < TEST_PROBE_THRESHOLD) {
 		dev_err(&(*pdev)->dev,
···
 
 	sync_id++;
 
-	delta = ktime_sub(ktime_get(), calltime);
-	duration = (unsigned long long) ktime_to_ms(delta);
+	duration = (unsigned long long)ktime_ms_delta(ktime_get(), calltime);
 	dev_info(&(*pdev)->dev,
 		 "registration took %lld msecs\n", duration);
 	if (duration < TEST_PROBE_THRESHOLD) {

drivers/base/topology.c

···
 define_id_show_func(physical_package_id);
 static DEVICE_ATTR_RO(physical_package_id);
 
+#ifdef TOPOLOGY_DIE_SYSFS
 define_id_show_func(die_id);
 static DEVICE_ATTR_RO(die_id);
+#endif
 
+#ifdef TOPOLOGY_CLUSTER_SYSFS
 define_id_show_func(cluster_id);
 static DEVICE_ATTR_RO(cluster_id);
+#endif
 
 define_id_show_func(core_id);
 static DEVICE_ATTR_RO(core_id);
···
 static BIN_ATTR_RO(core_siblings, 0);
 static BIN_ATTR_RO(core_siblings_list, 0);
 
+#ifdef TOPOLOGY_CLUSTER_SYSFS
 define_siblings_read_func(cluster_cpus, cluster_cpumask);
 static BIN_ATTR_RO(cluster_cpus, 0);
 static BIN_ATTR_RO(cluster_cpus_list, 0);
+#endif
 
+#ifdef TOPOLOGY_DIE_SYSFS
 define_siblings_read_func(die_cpus, die_cpumask);
 static BIN_ATTR_RO(die_cpus, 0);
 static BIN_ATTR_RO(die_cpus_list, 0);
+#endif
 
 define_siblings_read_func(package_cpus, core_cpumask);
 static BIN_ATTR_RO(package_cpus, 0);
 static BIN_ATTR_RO(package_cpus_list, 0);
 
-#ifdef CONFIG_SCHED_BOOK
+#ifdef TOPOLOGY_BOOK_SYSFS
 define_id_show_func(book_id);
 static DEVICE_ATTR_RO(book_id);
 define_siblings_read_func(book_siblings, book_cpumask);
···
 static BIN_ATTR_RO(book_siblings_list, 0);
 #endif
 
-#ifdef CONFIG_SCHED_DRAWER
+#ifdef TOPOLOGY_DRAWER_SYSFS
 define_id_show_func(drawer_id);
 static DEVICE_ATTR_RO(drawer_id);
 define_siblings_read_func(drawer_siblings, drawer_cpumask);
···
 	&bin_attr_thread_siblings_list,
 	&bin_attr_core_siblings,
 	&bin_attr_core_siblings_list,
+#ifdef TOPOLOGY_CLUSTER_SYSFS
 	&bin_attr_cluster_cpus,
 	&bin_attr_cluster_cpus_list,
+#endif
+#ifdef TOPOLOGY_DIE_SYSFS
 	&bin_attr_die_cpus,
 	&bin_attr_die_cpus_list,
+#endif
 	&bin_attr_package_cpus,
 	&bin_attr_package_cpus_list,
-#ifdef CONFIG_SCHED_BOOK
+#ifdef TOPOLOGY_BOOK_SYSFS
 	&bin_attr_book_siblings,
 	&bin_attr_book_siblings_list,
 #endif
-#ifdef CONFIG_SCHED_DRAWER
+#ifdef TOPOLOGY_DRAWER_SYSFS
 	&bin_attr_drawer_siblings,
 	&bin_attr_drawer_siblings_list,
 #endif
···
 
 static struct attribute *default_attrs[] = {
 	&dev_attr_physical_package_id.attr,
+#ifdef TOPOLOGY_DIE_SYSFS
 	&dev_attr_die_id.attr,
+#endif
+#ifdef TOPOLOGY_CLUSTER_SYSFS
 	&dev_attr_cluster_id.attr,
+#endif
 	&dev_attr_core_id.attr,
-#ifdef CONFIG_SCHED_BOOK
+#ifdef TOPOLOGY_BOOK_SYSFS
 	&dev_attr_book_id.attr,
 #endif
-#ifdef CONFIG_SCHED_DRAWER
+#ifdef TOPOLOGY_DRAWER_SYSFS
 	&dev_attr_drawer_id.attr,
 #endif
 	NULL

drivers/dma-buf/dma-buf-sysfs-stats.c

···
 
 
 /* Statistics files do not need to send uevents. */
-static int dmabuf_sysfs_uevent_filter(struct kset *kset, struct kobject *kobj)
+static int dmabuf_sysfs_uevent_filter(struct kobject *kobj)
 {
 	return 0;
 }

drivers/firmware/dmi-sysfs.c

···
 	&dmi_sysfs_attr_sel_per_log_type_descriptor_length.attr,
 	NULL,
 };
-
+ATTRIBUTE_GROUPS(dmi_sysfs_sel);
 
 static struct kobj_type dmi_system_event_log_ktype = {
 	.release = dmi_entry_free,
 	.sysfs_ops = &dmi_sysfs_specialize_attr_ops,
-	.default_attrs = dmi_sysfs_sel_attrs,
+	.default_groups = dmi_sysfs_sel_groups,
 };
 
 typedef u8 (*sel_io_reader)(const struct dmi_system_event_log *sel,
···
 	&dmi_sysfs_attr_entry_position.attr,
 	NULL,
 };
+ATTRIBUTE_GROUPS(dmi_sysfs_entry);
 
 static ssize_t dmi_entry_raw_read_helper(struct dmi_sysfs_entry *entry,
 					 const struct dmi_header *dh,
···
 static struct kobj_type dmi_sysfs_entry_ktype = {
 	.release = dmi_sysfs_entry_release,
 	.sysfs_ops = &dmi_sysfs_attr_ops,
-	.default_attrs = dmi_sysfs_entry_attrs,
+	.default_groups = dmi_sysfs_entry_groups,
 };
 
 static struct kset *dmi_kset;

drivers/firmware/edd.c

···
 static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
 static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);
 
-
-/* These are default attributes that are added for every edd
- * device discovered.  There are none.
- */
-static struct attribute * def_attrs[] = {
-	NULL,
-};
-
 /* These attributes are conditional and only added for some devices. */
 static struct edd_attribute * edd_attrs[] = {
 	&edd_attr_raw_data,
···
 static struct kobj_type edd_ktype = {
 	.release	= edd_release,
 	.sysfs_ops	= &edd_attr_ops,
-	.default_attrs	= def_attrs,
 };
 
 static struct kset *edd_kset;

drivers/firmware/memmap.c

···
 	&memmap_type_attr.attr,
 	NULL
 };
+ATTRIBUTE_GROUPS(def);
 
 static const struct sysfs_ops memmap_attr_ops = {
 	.show = memmap_attr_show,
···
 static struct kobj_type __refdata memmap_ktype = {
 	.release	= release_firmware_map_entry,
 	.sysfs_ops	= &memmap_attr_ops,
-	.default_attrs	= def_attrs,
+	.default_groups	= def_groups,
 };
 
 /*

drivers/firmware/qemu_fw_cfg.c

···
 	}
 }
 
-/* default_attrs: per-entry attributes and show methods */
+/* per-entry attributes and show methods */
 
 #define FW_CFG_SYSFS_ATTR(_attr) \
 struct fw_cfg_sysfs_attribute fw_cfg_sysfs_attr_##_attr = { \
···
 	&fw_cfg_sysfs_attr_name.attr,
 	NULL,
 };
+ATTRIBUTE_GROUPS(fw_cfg_sysfs_entry);
 
 /* sysfs_ops: find fw_cfg_[entry, attribute] and call appropriate show method */
 static ssize_t fw_cfg_sysfs_attr_show(struct kobject *kobj, struct attribute *a,
···
 
 /* kobj_type: ties together all properties required to register an entry */
 static struct kobj_type fw_cfg_sysfs_entry_ktype = {
-	.default_attrs = fw_cfg_sysfs_entry_attrs,
+	.default_groups = fw_cfg_sysfs_entry_groups,
 	.sysfs_ops = &fw_cfg_sysfs_attr_ops,
 	.release = fw_cfg_sysfs_release_entry,
 };

drivers/firmware/sysfb_simplefb.c

···
 	sysfb_apply_efi_quirks(pd);
 
 	ret = platform_device_add_resources(pd, &res, 1);
-	if (ret)
+	if (ret) {
+		platform_device_put(pd);
 		return ret;
+	}
 
 	ret = platform_device_add_data(pd, mode, sizeof(*mode));
-	if (ret)
+	if (ret) {
+		platform_device_put(pd);
 		return ret;
+	}
 
 	return platform_device_add(pd);
 }

drivers/infiniband/hw/irdma/main.c

···
 							    struct iidc_auxiliary_dev,
 							    adev);
 	struct ice_pf *pf = iidc_adev->pf;
-	struct irdma_device *iwdev = dev_get_drvdata(&aux_dev->dev);
+	struct irdma_device *iwdev = auxiliary_get_drvdata(aux_dev);
 
 	irdma_ib_unregister_device(iwdev);
 	ice_rdma_update_vsi_filter(pf, iwdev->vsi_num, false);
···
 	ice_rdma_update_vsi_filter(pf, iwdev->vsi_num, true);
 
 	ibdev_dbg(&iwdev->ibdev, "INIT: Gen2 PF[%d] device probe success\n", PCI_FUNC(rf->pcidev->devfn));
-	dev_set_drvdata(&aux_dev->dev, iwdev);
+	auxiliary_set_drvdata(aux_dev, iwdev);
 
 	return 0;
 

drivers/infiniband/hw/mlx5/main.c

···
 	}
 	mutex_unlock(&mlx5_ib_multiport_mutex);
 
-	dev_set_drvdata(&adev->dev, mpi);
+	auxiliary_set_drvdata(adev, mpi);
 	return 0;
 }
 
···
 {
 	struct mlx5_ib_multiport_info *mpi;
 
-	mpi = dev_get_drvdata(&adev->dev);
+	mpi = auxiliary_get_drvdata(adev);
 	mutex_lock(&mlx5_ib_multiport_mutex);
 	if (mpi->ibdev)
 		mlx5_ib_unbind_slave_port(mpi->ibdev, mpi);
···
 		return ret;
 	}
 
-	dev_set_drvdata(&adev->dev, dev);
+	auxiliary_set_drvdata(adev, dev);
 	return 0;
 }
 
···
 {
 	struct mlx5_ib_dev *dev;
 
-	dev = dev_get_drvdata(&adev->dev);
+	dev = auxiliary_get_drvdata(adev);
 	__mlx5_ib_remove(dev, dev->profile, MLX5_IB_STAGE_MAX);
 }
 

drivers/mfd/Kconfig

···
 	  Register and P-unit access. In addition this creates devices
 	  for iTCO watchdog and telemetry that are part of the PMC.
 
-config MFD_INTEL_PMT
-	tristate "Intel Platform Monitoring Technology (PMT) support"
-	depends on X86 && PCI
-	select MFD_CORE
-	help
-	  The Intel Platform Monitoring Technology (PMT) is an interface that
-	  provides access to hardware monitor registers. This driver supports
-	  Telemetry, Watcher, and Crashlog PMT capabilities/devices for
-	  platforms starting from Tiger Lake.
-
 config MFD_IPAQ_MICRO
 	bool "Atmel Micro ASIC (iPAQ h3100/h3600/h3700) Support"
 	depends on SA1100_H3100 || SA1100_H3600

drivers/mfd/Makefile

···
 obj-$(CONFIG_MFD_INTEL_LPSS_PCI)	+= intel-lpss-pci.o
 obj-$(CONFIG_MFD_INTEL_LPSS_ACPI)	+= intel-lpss-acpi.o
 obj-$(CONFIG_MFD_INTEL_PMC_BXT)	+= intel_pmc_bxt.o
-obj-$(CONFIG_MFD_INTEL_PMT)	+= intel_pmt.o
 obj-$(CONFIG_MFD_PALMAS)	+= palmas.o
 obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
 obj-$(CONFIG_MFD_NTXEC)		+= ntxec.o

drivers/mfd/intel_pmt.c

···
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Intel Platform Monitoring Technology PMT driver
- *
- * Copyright (c) 2020, Intel Corporation.
- * All Rights Reserved.
- *
- * Author: David E. Box <[e-mail]>
- */
-
-#include <linux/bits.h>
-#include <linux/kernel.h>
-#include <linux/mfd/core.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/platform_device.h>
-#include <linux/pm.h>
-#include <linux/pm_runtime.h>
-#include <linux/types.h>
-
-/* Intel DVSEC capability vendor space offsets */
-#define INTEL_DVSEC_ENTRIES		0xA
-#define INTEL_DVSEC_SIZE		0xB
-#define INTEL_DVSEC_TABLE		0xC
-#define INTEL_DVSEC_TABLE_BAR(x)	((x) & GENMASK(2, 0))
-#define INTEL_DVSEC_TABLE_OFFSET(x)	((x) & GENMASK(31, 3))
-#define INTEL_DVSEC_ENTRY_SIZE		4
-
-/* PMT capabilities */
-#define DVSEC_INTEL_ID_TELEMETRY	2
-#define DVSEC_INTEL_ID_WATCHER		3
-#define DVSEC_INTEL_ID_CRASHLOG		4
-
-struct intel_dvsec_header {
-	u16	length;
-	u16	id;
-	u8	num_entries;
-	u8	entry_size;
-	u8	tbir;
-	u32	offset;
-};
-
-enum pmt_quirks {
-	/* Watcher capability not supported */
-	PMT_QUIRK_NO_WATCHER	= BIT(0),
-
-	/* Crashlog capability not supported */
-	PMT_QUIRK_NO_CRASHLOG	= BIT(1),
-
-	/* Use shift instead of mask to read discovery table offset */
-	PMT_QUIRK_TABLE_SHIFT	= BIT(2),
-
-	/* DVSEC not present (provided in driver data) */
-	PMT_QUIRK_NO_DVSEC	= BIT(3),
-};
-
-struct pmt_platform_info {
-	unsigned long quirks;
-	struct intel_dvsec_header **capabilities;
-};
-
-static const struct pmt_platform_info tgl_info = {
-	.quirks = PMT_QUIRK_NO_WATCHER | PMT_QUIRK_NO_CRASHLOG |
-		  PMT_QUIRK_TABLE_SHIFT,
-};
-
-/* DG1 Platform with DVSEC quirk*/
-static struct intel_dvsec_header dg1_telemetry = {
-	.length = 0x10,
-	.id = 2,
-	.num_entries = 1,
-	.entry_size = 3,
-	.tbir = 0,
-	.offset = 0x466000,
-};
-
-static struct intel_dvsec_header *dg1_capabilities[] = {
-	&dg1_telemetry,
-	NULL
-};
-
-static const struct pmt_platform_info dg1_info = {
-	.quirks = PMT_QUIRK_NO_DVSEC,
-	.capabilities = dg1_capabilities,
-};
-
-static int pmt_add_dev(struct pci_dev *pdev, struct intel_dvsec_header *header,
-		       unsigned long quirks)
-{
-	struct device *dev = &pdev->dev;
-	struct resource *res, *tmp;
-	struct mfd_cell *cell;
-	const char *name;
-	int count = header->num_entries;
-	int size = header->entry_size;
-	int id = header->id;
-	int i;
-
-	switch (id) {
-	case DVSEC_INTEL_ID_TELEMETRY:
-		name = "pmt_telemetry";
-		break;
-	case DVSEC_INTEL_ID_WATCHER:
-		if (quirks & PMT_QUIRK_NO_WATCHER) {
-			dev_info(dev, "Watcher not supported\n");
-			return -EINVAL;
-		}
-		name = "pmt_watcher";
-		break;
-	case DVSEC_INTEL_ID_CRASHLOG:
-		if (quirks & PMT_QUIRK_NO_CRASHLOG) {
-			dev_info(dev, "Crashlog not supported\n");
-			return -EINVAL;
-		}
-		name = "pmt_crashlog";
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	if (!header->num_entries || !header->entry_size) {
-		dev_err(dev, "Invalid count or size for %s header\n", name);
-		return -EINVAL;
-	}
-
-	cell = devm_kzalloc(dev, sizeof(*cell), GFP_KERNEL);
-	if (!cell)
-		return -ENOMEM;
-
-	res = devm_kcalloc(dev, count, sizeof(*res), GFP_KERNEL);
-	if (!res)
-		return -ENOMEM;
-
-	if (quirks & PMT_QUIRK_TABLE_SHIFT)
-		header->offset >>= 3;
-
-	/*
-	 * The PMT DVSEC contains the starting offset and count for a block of
-	 * discovery tables, each providing access to monitoring facilities for
-	 * a section of the device. Create a resource list of these tables to
-	 * provide to the driver.
-	 */
-	for (i = 0, tmp = res; i < count; i++, tmp++) {
-		tmp->start = pdev->resource[header->tbir].start +
-			     header->offset + i * (size << 2);
-		tmp->end = tmp->start + (size << 2) - 1;
-		tmp->flags = IORESOURCE_MEM;
-	}
-
-	cell->resources = res;
-	cell->num_resources = count;
-	cell->name = name;
-
-	return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cell, 1, NULL, 0,
-				    NULL);
-}
-
-static int pmt_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
-{
-	struct pmt_platform_info *info;
-	unsigned long quirks = 0;
-	bool found_devices = false;
-	int ret, pos = 0;
-
-	ret = pcim_enable_device(pdev);
-	if (ret)
-		return ret;
-
-	info = (struct pmt_platform_info *)id->driver_data;
-
-	if (info)
-		quirks = info->quirks;
-
-	if (info && (info->quirks & PMT_QUIRK_NO_DVSEC)) {
-		struct intel_dvsec_header **header;
-
-		header = info->capabilities;
-		while (*header) {
-			ret = pmt_add_dev(pdev, *header, quirks);
-			if (ret)
-				dev_warn(&pdev->dev,
-					 "Failed to add device for DVSEC id %d\n",
-					 (*header)->id);
-			else
-				found_devices = true;
-
-			++header;
-		}
-	} else {
-		do {
-			struct intel_dvsec_header header;
-			u32 table;
-			u16 vid;
-
-			pos = pci_find_next_ext_capability(pdev, pos, PCI_EXT_CAP_ID_DVSEC);
-			if (!pos)
-				break;
-
-			pci_read_config_word(pdev, pos + PCI_DVSEC_HEADER1, &vid);
-			if (vid != PCI_VENDOR_ID_INTEL)
-				continue;
-
-			pci_read_config_word(pdev, pos + PCI_DVSEC_HEADER2,
-					     &header.id);
-			pci_read_config_byte(pdev, pos + INTEL_DVSEC_ENTRIES,
-					     &header.num_entries);
-			pci_read_config_byte(pdev, pos + INTEL_DVSEC_SIZE,
-					     &header.entry_size);
-			pci_read_config_dword(pdev, pos + INTEL_DVSEC_TABLE,
-					      &table);
-
-			header.tbir = INTEL_DVSEC_TABLE_BAR(table);
-			header.offset = INTEL_DVSEC_TABLE_OFFSET(table);
-
-			ret = pmt_add_dev(pdev, &header, quirks);
-			if (ret)
-				continue;
-
-			found_devices = true;
-		} while (true);
-	}
-
-	if (!found_devices)
-		return -ENODEV;
-
-	pm_runtime_put(&pdev->dev);
-	pm_runtime_allow(&pdev->dev);
-
-	return 0;
-}
-
-static void pmt_pci_remove(struct pci_dev *pdev)
-{
-	pm_runtime_forbid(&pdev->dev);
-	pm_runtime_get_sync(&pdev->dev);
-}
-
-#define PCI_DEVICE_ID_INTEL_PMT_ADL	0x467d
-#define PCI_DEVICE_ID_INTEL_PMT_DG1	0x490e
-#define PCI_DEVICE_ID_INTEL_PMT_OOBMSM	0x09a7
-#define PCI_DEVICE_ID_INTEL_PMT_TGL	0x9a0d
-static const struct pci_device_id pmt_pci_ids[] = {
-	{ PCI_DEVICE_DATA(INTEL, PMT_ADL, &tgl_info) },
-	{ PCI_DEVICE_DATA(INTEL, PMT_DG1, &dg1_info) },
-	{ PCI_DEVICE_DATA(INTEL, PMT_OOBMSM, NULL) },
-	{ PCI_DEVICE_DATA(INTEL, PMT_TGL, &tgl_info) },
-	{ }
-};
-MODULE_DEVICE_TABLE(pci, pmt_pci_ids);
-
-static struct pci_driver pmt_pci_driver = {
-	.name = "intel-pmt",
-	.id_table = pmt_pci_ids,
-	.probe = pmt_pci_probe,
-	.remove = pmt_pci_remove,
-};
-module_pci_driver(pmt_pci_driver);
-
-MODULE_AUTHOR("David E. Box <[e-mail]>");
-MODULE_DESCRIPTION("Intel Platform Monitoring Technology PMT driver");
-MODULE_LICENSE("GPL v2");

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

···
 static int mlx5e_resume(struct auxiliary_device *adev)
 {
 	struct mlx5_adev *edev = container_of(adev, struct mlx5_adev, adev);
-	struct mlx5e_priv *priv = dev_get_drvdata(&adev->dev);
+	struct mlx5e_priv *priv = auxiliary_get_drvdata(adev);
 	struct net_device *netdev = priv->netdev;
 	struct mlx5_core_dev *mdev = edev->mdev;
 	int err;
···
 
 static int mlx5e_suspend(struct auxiliary_device *adev, pm_message_t state)
 {
-	struct mlx5e_priv *priv = dev_get_drvdata(&adev->dev);
+	struct mlx5e_priv *priv = auxiliary_get_drvdata(adev);
 	struct net_device *netdev = priv->netdev;
 	struct mlx5_core_dev *mdev = priv->mdev;
 
···
 	mlx5e_build_nic_netdev(netdev);
 
 	priv = netdev_priv(netdev);
-	dev_set_drvdata(&adev->dev, priv);
+	auxiliary_set_drvdata(adev, priv);
 
 	priv->profile = profile;
 	priv->ppriv = NULL;
···
 
 static void mlx5e_remove(struct auxiliary_device *adev)
 {
-	struct mlx5e_priv *priv = dev_get_drvdata(&adev->dev);
+	struct mlx5e_priv *priv = auxiliary_get_drvdata(adev);
 	pm_message_t state = {};
 
 	mlx5e_dcbnl_delete_app(priv);

drivers/platform/x86/intel/Kconfig

···
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called intel-uncore-frequency.
+
+config INTEL_VSEC
+	tristate "Intel Vendor Specific Extended Capabilities Driver"
+	depends on PCI
+	select AUXILIARY_BUS
+	help
+	  Adds support for feature drivers exposed using Intel PCIe VSEC and
+	  DVSEC.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called intel_vsec.

drivers/platform/x86/intel/Makefile

···
 obj-$(CONFIG_INTEL_INT0002_VGPIO)	+= intel_int0002_vgpio.o
 intel_oaktrail-y			:= oaktrail.o
 obj-$(CONFIG_INTEL_OAKTRAIL)		+= intel_oaktrail.o
+intel_vsec-y				:= vsec.o
+obj-$(CONFIG_INTEL_VSEC)		+= intel_vsec.o
 
 # Intel PMIC / PMC / P-Unit drivers
 intel_bxtwc_tmu-y			:= bxtwc_tmu.o

drivers/platform/x86/intel/pmt/Kconfig

···
 
 config INTEL_PMT_TELEMETRY
 	tristate "Intel Platform Monitoring Technology (PMT) Telemetry driver"
-	depends on MFD_INTEL_PMT
+	depends on INTEL_VSEC
 	select INTEL_PMT_CLASS
 	help
 	  The Intel Platform Monitory Technology (PMT) Telemetry driver provides
···
 
 config INTEL_PMT_CRASHLOG
 	tristate "Intel Platform Monitoring Technology (PMT) Crashlog driver"
-	depends on MFD_INTEL_PMT
+	depends on INTEL_VSEC
 	select INTEL_PMT_CLASS
 	help
 	  The Intel Platform Monitoring Technology (PMT) crashlog driver provides

drivers/platform/x86/intel/pmt/class.c

···
 #include <linux/mm.h>
 #include <linux/pci.h>
 
+#include "../vsec.h"
 #include "class.h"
 
 #define PMT_XA_START		0
···
 	return ret;
 }
 
-int intel_pmt_dev_create(struct intel_pmt_entry *entry,
-			 struct intel_pmt_namespace *ns,
-			 struct platform_device *pdev, int idx)
+int intel_pmt_dev_create(struct intel_pmt_entry *entry, struct intel_pmt_namespace *ns,
+			 struct intel_vsec_device *intel_vsec_dev, int idx)
 {
+	struct device *dev = &intel_vsec_dev->auxdev.dev;
 	struct intel_pmt_header header;
 	struct resource	*disc_res;
-	int ret = -ENODEV;
+	int ret;
 
-	disc_res = platform_get_resource(pdev, IORESOURCE_MEM, idx);
-	if (!disc_res)
-		return ret;
+	disc_res = &intel_vsec_dev->resource[idx];
 
-	entry->disc_table = devm_platform_ioremap_resource(pdev, idx);
+	entry->disc_table = devm_ioremap_resource(dev, disc_res);
 	if (IS_ERR(entry->disc_table))
 		return PTR_ERR(entry->disc_table);
 
-	ret = ns->pmt_header_decode(entry, &header, &pdev->dev);
+	ret = ns->pmt_header_decode(entry, &header, dev);
 	if (ret)
 		return ret;
 
-	ret = intel_pmt_populate_entry(entry, &header, &pdev->dev, disc_res);
+	ret = intel_pmt_populate_entry(entry, &header, dev, disc_res);
 	if (ret)
 		return ret;
 
-	return intel_pmt_dev_register(entry, ns, &pdev->dev);
+	return intel_pmt_dev_register(entry, ns, dev);
 
 }
 EXPORT_SYMBOL_GPL(intel_pmt_dev_create);

drivers/platform/x86/intel/pmt/class.h

···
 #ifndef _INTEL_PMT_CLASS_H
 #define _INTEL_PMT_CLASS_H
 
-#include <linux/platform_device.h>
 #include <linux/xarray.h>
 #include <linux/types.h>
 #include <linux/bits.h>
 #include <linux/err.h>
 #include <linux/io.h>
+
+#include "../vsec.h"
 
 /* PMT access types */
 #define ACCESS_BARID		2
···
 bool intel_pmt_is_early_client_hw(struct device *dev);
 int intel_pmt_dev_create(struct intel_pmt_entry *entry,
 			 struct intel_pmt_namespace *ns,
-			 struct platform_device *pdev, int idx);
+			 struct intel_vsec_device *dev, int idx);
 void intel_pmt_dev_destroy(struct intel_pmt_entry *entry,
 			   struct intel_pmt_namespace *ns);
 #endif

drivers/platform/x86/intel/pmt/crashlog.c

···
  * Author: "Alexander Duyck" <[e-mail]>
  */
 
+#include <linux/auxiliary_bus.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
···
 #include <linux/uaccess.h>
 #include <linux/overflow.h>
 
+#include "../vsec.h"
 #include "class.h"
-
-#define DRV_NAME		"pmt_crashlog"
 
 /* Crashlog discovery header types */
 #define CRASH_TYPE_OOBMSM	1
···
 /*
  * initialization
  */
-static int pmt_crashlog_remove(struct platform_device *pdev)
+static void pmt_crashlog_remove(struct auxiliary_device *auxdev)
 {
-	struct pmt_crashlog_priv *priv = platform_get_drvdata(pdev);
+	struct pmt_crashlog_priv *priv = auxiliary_get_drvdata(auxdev);
 	int i;
 
 	for (i = 0; i < priv->num_entries; i++)
 		intel_pmt_dev_destroy(&priv->entry[i].entry, &pmt_crashlog_ns);
-
-	return 0;
 }
 
-static int pmt_crashlog_probe(struct platform_device *pdev)
+static int pmt_crashlog_probe(struct auxiliary_device *auxdev,
+			      const struct auxiliary_device_id *id)
 {
+	struct intel_vsec_device *intel_vsec_dev = auxdev_to_ivdev(auxdev);
 	struct pmt_crashlog_priv *priv;
 	size_t size;
 	int i, ret;
 
-	size = struct_size(priv, entry, pdev->num_resources);
-	priv = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+	size = struct_size(priv, entry, intel_vsec_dev->num_resources);
+	priv = devm_kzalloc(&auxdev->dev, size, GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
-	platform_set_drvdata(pdev, priv);
+	auxiliary_set_drvdata(auxdev, priv);
 
-	for (i = 0; i < pdev->num_resources; i++) {
+	for (i = 0; i < intel_vsec_dev->num_resources; i++) {
 		struct intel_pmt_entry *entry = &priv->entry[i].entry;
 
-		ret = intel_pmt_dev_create(entry, &pmt_crashlog_ns, pdev, i);
+		ret = intel_pmt_dev_create(entry, &pmt_crashlog_ns, intel_vsec_dev, i);
 		if (ret < 0)
 			goto abort_probe;
 		if (ret)
···
 
 	return 0;
 abort_probe:
-	pmt_crashlog_remove(pdev);
+	pmt_crashlog_remove(auxdev);
 	return ret;
 }
 
-static struct platform_driver pmt_crashlog_driver = {
-	.driver = {
-		.name   = DRV_NAME,
-	},
-	.remove = pmt_crashlog_remove,
-	.probe  = pmt_crashlog_probe,
+static const struct auxiliary_device_id pmt_crashlog_id_table[] = {
+	{ .name = "intel_vsec.crashlog" },
+	{}
+};
+MODULE_DEVICE_TABLE(auxiliary, pmt_crashlog_id_table);
+
+static struct auxiliary_driver pmt_crashlog_aux_driver = {
+	.id_table	= pmt_crashlog_id_table,
+	.remove		= pmt_crashlog_remove,
+	.probe		= pmt_crashlog_probe,
 };
 
 static int __init pmt_crashlog_init(void)
 {
-	return platform_driver_register(&pmt_crashlog_driver);
+	return auxiliary_driver_register(&pmt_crashlog_aux_driver);
 }
 
 static void __exit pmt_crashlog_exit(void)
 {
-	platform_driver_unregister(&pmt_crashlog_driver);
+	auxiliary_driver_unregister(&pmt_crashlog_aux_driver);
 	xa_destroy(&crashlog_array);
 }
 
···
 
 MODULE_AUTHOR("Alexander Duyck <[e-mail]>");
 MODULE_DESCRIPTION("Intel PMT Crashlog driver");
-MODULE_ALIAS("platform:" DRV_NAME);
 MODULE_LICENSE("GPL v2");

drivers/platform/x86/intel/pmt/telemetry.c

···
  * Author: "David E. Box" <[e-mail]>
  */
 
+#include <linux/auxiliary_bus.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
···
 #include <linux/uaccess.h>
 #include <linux/overflow.h>
 
+#include "../vsec.h"
 #include "class.h"
-
-#define TELEM_DEV_NAME		"pmt_telemetry"
 
 #define TELEM_SIZE_OFFSET	0x0
 #define TELEM_GUID_OFFSET	0x4
···
 	.pmt_header_decode = pmt_telem_header_decode,
 };
 
-static int pmt_telem_remove(struct platform_device *pdev)
+static void pmt_telem_remove(struct auxiliary_device *auxdev)
 {
-	struct pmt_telem_priv *priv = platform_get_drvdata(pdev);
+	struct pmt_telem_priv *priv = auxiliary_get_drvdata(auxdev);
 	int i;
 
 	for (i = 0; i < priv->num_entries; i++)
 		intel_pmt_dev_destroy(&priv->entry[i], &pmt_telem_ns);
-
-	return 0;
 }
 
-static int pmt_telem_probe(struct platform_device *pdev)
+static int pmt_telem_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id)
 {
+	struct intel_vsec_device *intel_vsec_dev = auxdev_to_ivdev(auxdev);
 	struct pmt_telem_priv *priv;
 	size_t size;
 	int i, ret;
 
-	size = struct_size(priv, entry, pdev->num_resources);
-	priv = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+	size = struct_size(priv, entry, intel_vsec_dev->num_resources);
+	priv = devm_kzalloc(&auxdev->dev, size, GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
-	platform_set_drvdata(pdev, priv);
+	auxiliary_set_drvdata(auxdev, priv);
 
-	for (i = 0; i < pdev->num_resources; i++) {
+	for (i = 0; i < intel_vsec_dev->num_resources; i++) {
 		struct intel_pmt_entry *entry = &priv->entry[i];
 
-		ret = intel_pmt_dev_create(entry, &pmt_telem_ns, pdev, i);
+		ret = intel_pmt_dev_create(entry, &pmt_telem_ns, intel_vsec_dev, i);
 		if (ret < 0)
 			goto abort_probe;
 		if (ret)
···
 
 	return 0;
 abort_probe:
-	pmt_telem_remove(pdev);
+	pmt_telem_remove(auxdev);
 	return ret;
 }
 
-static struct platform_driver pmt_telem_driver = {
-	.driver = {
-		.name   = TELEM_DEV_NAME,
-	},
-	.remove = pmt_telem_remove,
-	.probe  = pmt_telem_probe,
+static const struct auxiliary_device_id pmt_telem_id_table[] = {
+	{ .name = "intel_vsec.telemetry" },
+	{}
+};
+MODULE_DEVICE_TABLE(auxiliary, pmt_telem_id_table);
+
+static struct auxiliary_driver pmt_telem_aux_driver = {
+	.id_table	= pmt_telem_id_table,
+	.remove		= pmt_telem_remove,
+	.probe		= pmt_telem_probe,
 };
 
 static int __init pmt_telem_init(void)
 {
-	return platform_driver_register(&pmt_telem_driver);
+	return auxiliary_driver_register(&pmt_telem_aux_driver);
 }
 module_init(pmt_telem_init);
 
 static void __exit pmt_telem_exit(void)
 {
-	platform_driver_unregister(&pmt_telem_driver);
+	auxiliary_driver_unregister(&pmt_telem_aux_driver);
 	xa_destroy(&telem_array);
 }
 module_exit(pmt_telem_exit);
 
 MODULE_AUTHOR("David E. Box <[e-mail]>");
 MODULE_DESCRIPTION("Intel PMT Telemetry driver");
-MODULE_ALIAS("platform:" TELEM_DEV_NAME);
 MODULE_LICENSE("GPL v2");

drivers/platform/x86/intel/vsec.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel Vendor Specific Extended Capabilities auxiliary bus driver
+ *
+ * Copyright (c) 2021, Intel Corporation.
+ * All Rights Reserved.
+ *
+ * Author: David E. Box <[e-mail]>
+ *
+ * This driver discovers and creates auxiliary devices for Intel defined PCIe
+ * "Vendor Specific" and "Designated Vendor Specific" Extended Capabilities,
+ * VSEC and DVSEC respectively. The driver supports features on specific PCIe
+ * endpoints that exist primarily to expose them.
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/bits.h>
+#include <linux/kernel.h>
+#include <linux/idr.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+
+#include "vsec.h"
+
+/* Intel DVSEC offsets */
+#define INTEL_DVSEC_ENTRIES		0xA
+#define INTEL_DVSEC_SIZE		0xB
+#define INTEL_DVSEC_TABLE		0xC
+#define INTEL_DVSEC_TABLE_BAR(x)	((x) & GENMASK(2, 0))
+#define INTEL_DVSEC_TABLE_OFFSET(x)	((x) & GENMASK(31, 3))
+#define TABLE_OFFSET_SHIFT		3
+
+static DEFINE_IDA(intel_vsec_ida);
+
+/**
+ * struct intel_vsec_header - Common fields of Intel VSEC and DVSEC registers.
+ * @rev:         Revision ID of the VSEC/DVSEC register space
+ * @length:      Length of the VSEC/DVSEC register space
+ * @id:          ID of the feature
+ * @num_entries: Number of instances of the feature
+ * @entry_size:  Size of the discovery table for each feature
+ * @tbir:        BAR containing the discovery tables
+ * @offset:      BAR offset of start of the first discovery table
+ */
+struct intel_vsec_header {
+	u8	rev;
+	u16	length;
+	u16	id;
+	u8	num_entries;
+	u8	entry_size;
+	u8	tbir;
+	u32	offset;
+};
+
+/* Platform specific data */
+struct intel_vsec_platform_info {
+	struct intel_vsec_header **capabilities;
+	unsigned long quirks;
+};
+
+enum intel_vsec_id {
+	VSEC_ID_TELEMETRY	= 2,
+	VSEC_ID_WATCHER		= 3,
+	VSEC_ID_CRASHLOG	= 4,
+};
+
+static enum intel_vsec_id intel_vsec_allow_list[] = {
+	VSEC_ID_TELEMETRY,
+	VSEC_ID_WATCHER,
+	VSEC_ID_CRASHLOG,
+};
+
+static const char *intel_vsec_name(enum intel_vsec_id id)
+{
+	switch (id) {
+	case VSEC_ID_TELEMETRY:
+		return "telemetry";
+
+	case VSEC_ID_WATCHER:
+		return "watcher";
+
+	case VSEC_ID_CRASHLOG:
+		return "crashlog";
+
+	default:
+		return NULL;
+	}
+}
+
+static bool intel_vsec_allowed(u16 id)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(intel_vsec_allow_list); i++)
+		if (intel_vsec_allow_list[i] == id)
+			return true;
+
+	return false;
+}
+
+static bool intel_vsec_disabled(u16 id, unsigned long quirks)
+{
+	switch (id) {
+	case VSEC_ID_WATCHER:
+		return !!(quirks & VSEC_QUIRK_NO_WATCHER);
+
+	case VSEC_ID_CRASHLOG:
+		return !!(quirks & VSEC_QUIRK_NO_CRASHLOG);
+
+	default:
+		return false;
+	}
+}
+
+static void intel_vsec_remove_aux(void *data)
+{
+	auxiliary_device_delete(data);
+	auxiliary_device_uninit(data);
+}
+
+static void intel_vsec_dev_release(struct device *dev)
+{
+	struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(dev);
+
+	ida_free(intel_vsec_dev->ida, intel_vsec_dev->auxdev.id);
+	kfree(intel_vsec_dev->resource);
+	kfree(intel_vsec_dev);
+}
+
+static int intel_vsec_add_aux(struct pci_dev *pdev, struct intel_vsec_device *intel_vsec_dev,
+			      const char *name)
+{
+	struct auxiliary_device *auxdev = &intel_vsec_dev->auxdev;
+	int ret;
+
+	ret = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
+	if (ret < 0) {
+		kfree(intel_vsec_dev);
+		return ret;
+	}
+
+	auxdev->id = ret;
+	auxdev->name = name;
+	auxdev->dev.parent = &pdev->dev;
+	auxdev->dev.release = intel_vsec_dev_release;
+
+	ret = auxiliary_device_init(auxdev);
+	if (ret < 0) {
+		ida_free(intel_vsec_dev->ida, auxdev->id);
+		kfree(intel_vsec_dev->resource);
+		kfree(intel_vsec_dev);
+		return ret;
+	}
+
+	ret = auxiliary_device_add(auxdev);
+	if (ret < 0) {
+		auxiliary_device_uninit(auxdev);
+		return ret;
+	}
+
+	return devm_add_action_or_reset(&pdev->dev, intel_vsec_remove_aux, auxdev);
+}
+
+static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *header,
+			   unsigned long quirks)
+{
+	struct intel_vsec_device *intel_vsec_dev;
+	struct resource *res, *tmp;
+	int i;
+
+	if (!intel_vsec_allowed(header->id) || intel_vsec_disabled(header->id, quirks))
+		return -EINVAL;
+
+	if (!header->num_entries) {
+		dev_dbg(&pdev->dev, "Invalid 0 entry count for header id %d\n", header->id);
+		return -EINVAL;
+	}
+
+	if (!header->entry_size) {
+		dev_dbg(&pdev->dev, "Invalid 0 entry size for header id %d\n", header->id);
+		return -EINVAL;
+	}
+
+	intel_vsec_dev = kzalloc(sizeof(*intel_vsec_dev), GFP_KERNEL);
+	if (!intel_vsec_dev)
+		return -ENOMEM;
+
+	res = kcalloc(header->num_entries, sizeof(*res), GFP_KERNEL);
+	if (!res) {
+		kfree(intel_vsec_dev);
+		return -ENOMEM;
+	}
+
+	if (quirks & VSEC_QUIRK_TABLE_SHIFT)
+		header->offset >>= TABLE_OFFSET_SHIFT;
+
+	/*
+	 * The DVSEC/VSEC contains the starting offset and count for a block of
+	 * discovery tables. Create a resource array of these tables to the
+	 * auxiliary device driver.
+	 */
+	for (i = 0, tmp = res; i < header->num_entries; i++, tmp++) {
+		tmp->start = pdev->resource[header->tbir].start +
+			     header->offset + i * (header->entry_size * sizeof(u32));
+		tmp->end = tmp->start + (header->entry_size * sizeof(u32)) - 1;
+		tmp->flags = IORESOURCE_MEM;
+	}
+
+	intel_vsec_dev->pcidev = pdev;
+	intel_vsec_dev->resource = res;
+	intel_vsec_dev->num_resources = header->num_entries;
+	intel_vsec_dev->quirks = quirks;
+	intel_vsec_dev->ida = &intel_vsec_ida;
+
+	return intel_vsec_add_aux(pdev, intel_vsec_dev, intel_vsec_name(header->id));
+}
+
+static bool intel_vsec_walk_header(struct pci_dev *pdev, unsigned long quirks,
+				struct intel_vsec_header **header)
+{
+	bool have_devices = false;
+	int ret;
+
+	for ( ; *header; header++) {
+		ret = intel_vsec_add_dev(pdev, *header, quirks);
+		if (ret)
+			dev_info(&pdev->dev, "Could not add device for DVSEC id %d\n",
+				 (*header)->id);
+		else
+			have_devices = true;
+	}
+
+	return have_devices;
+}
+
+static bool intel_vsec_walk_dvsec(struct pci_dev *pdev, unsigned long quirks)
+{
+	bool have_devices = false;
+	int pos = 0;
+
+	do {
+		struct intel_vsec_header header;
+		u32 table, hdr;
+		u16 vid;
+		int ret;
+
+		pos = pci_find_next_ext_capability(pdev, pos, PCI_EXT_CAP_ID_DVSEC);
+		if (!pos)
+			break;
+
+		pci_read_config_dword(pdev, pos + PCI_DVSEC_HEADER1, &hdr);
+		vid = PCI_DVSEC_HEADER1_VID(hdr);
+		if (vid != PCI_VENDOR_ID_INTEL)
+			continue;
+
+		/* Support only revision 1 */
+		header.rev = PCI_DVSEC_HEADER1_REV(hdr);
+		if (header.rev != 1) {
+			dev_info(&pdev->dev, "Unsupported DVSEC revision %d\n", header.rev);
+			continue;
+		}
+
+		header.length = PCI_DVSEC_HEADER1_LEN(hdr);
+
+		pci_read_config_byte(pdev, pos + INTEL_DVSEC_ENTRIES, &header.num_entries);
+		pci_read_config_byte(pdev, pos + INTEL_DVSEC_SIZE, &header.entry_size);
+		pci_read_config_dword(pdev, pos + INTEL_DVSEC_TABLE, &table);
+
+		header.tbir = INTEL_DVSEC_TABLE_BAR(table);
+		header.offset = INTEL_DVSEC_TABLE_OFFSET(table);
+
+		pci_read_config_dword(pdev, pos + PCI_DVSEC_HEADER2, &hdr);
+		header.id = PCI_DVSEC_HEADER2_ID(hdr);
+
+		ret = intel_vsec_add_dev(pdev, &header, quirks);
+		if (ret)
+			continue;
+
+		have_devices = true;
+	} while (true);
+
+	return have_devices;
+}
+
+static bool intel_vsec_walk_vsec(struct pci_dev *pdev, unsigned long quirks)
+{
+	bool have_devices = false;
+	int pos = 0;
+
+	do {
+		struct intel_vsec_header header;
+		u32 table, hdr;
+		int ret;
+
+		pos = pci_find_next_ext_capability(pdev, pos, PCI_EXT_CAP_ID_VNDR);
+		if (!pos)
+			break;
+
+		pci_read_config_dword(pdev, pos + PCI_VNDR_HEADER, &hdr);
+
+		/* Support only revision 1 */
+		header.rev = PCI_VNDR_HEADER_REV(hdr);
+		if (header.rev != 1) {
+			dev_info(&pdev->dev, "Unsupported VSEC revision %d\n", header.rev);
+			continue;
+		}
+
+		header.id = PCI_VNDR_HEADER_ID(hdr);
+		header.length = PCI_VNDR_HEADER_LEN(hdr);
+
+		/* entry, size, and table offset are the same as DVSEC */
+		pci_read_config_byte(pdev, pos + INTEL_DVSEC_ENTRIES, &header.num_entries);
+		pci_read_config_byte(pdev, pos + INTEL_DVSEC_SIZE, &header.entry_size);
+		pci_read_config_dword(pdev, pos + INTEL_DVSEC_TABLE, &table);
+
+		header.tbir = INTEL_DVSEC_TABLE_BAR(table);
+		header.offset = INTEL_DVSEC_TABLE_OFFSET(table);
+
+		ret = intel_vsec_add_dev(pdev, &header, quirks);
+		if (ret)
+			continue;
+
+		have_devices = true;
+	} while (true);
+
+	return have_devices;
+}
+
+static int intel_vsec_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct intel_vsec_platform_info *info;
+	bool have_devices = false;
+	unsigned long quirks = 0;
+	int ret;
+
+	ret = pcim_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	info = (struct intel_vsec_platform_info *)id->driver_data;
+	if (info)
+		quirks = info->quirks;
+
+	if (intel_vsec_walk_dvsec(pdev, quirks))
+		have_devices = true;
+
+	if (intel_vsec_walk_vsec(pdev, quirks))
+		have_devices = true;
+
+	if (info && (info->quirks & VSEC_QUIRK_NO_DVSEC) &&
+	    intel_vsec_walk_header(pdev, quirks, info->capabilities))
+		have_devices = true;
+
+	if (!have_devices)
+		return -ENODEV;
+
+	return 0;
+}
+
+/* TGL info */
+static const struct intel_vsec_platform_info tgl_info = {
+	.quirks = VSEC_QUIRK_NO_WATCHER | VSEC_QUIRK_NO_CRASHLOG | VSEC_QUIRK_TABLE_SHIFT,
+};
+
+/* DG1 info */
+static struct intel_vsec_header dg1_telemetry = {
+	.length = 0x10,
+	.id = 2,
+	.num_entries = 1,
+	.entry_size = 3,
+	.tbir = 0,
+	.offset = 0x466000,
+};
+
+static struct intel_vsec_header *dg1_capabilities[] = {
+	&dg1_telemetry,
+	NULL
+};
+
+static const struct intel_vsec_platform_info dg1_info = {
+	.capabilities = dg1_capabilities,
+	.quirks = VSEC_QUIRK_NO_DVSEC,
+};
+
+#define PCI_DEVICE_ID_INTEL_VSEC_ADL		0x467d
+#define PCI_DEVICE_ID_INTEL_VSEC_DG1		0x490e
+#define PCI_DEVICE_ID_INTEL_VSEC_OOBMSM		0x09a7
+#define PCI_DEVICE_ID_INTEL_VSEC_TGL		0x9a0d
+static const struct pci_device_id intel_vsec_pci_ids[] = {
+	{ PCI_DEVICE_DATA(INTEL, VSEC_ADL, &tgl_info) },
+	{ PCI_DEVICE_DATA(INTEL, VSEC_DG1, &dg1_info) },
+	{ PCI_DEVICE_DATA(INTEL, VSEC_OOBMSM, NULL) },
+	{ PCI_DEVICE_DATA(INTEL, VSEC_TGL, &tgl_info) },
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, intel_vsec_pci_ids);
+
+static struct pci_driver intel_vsec_pci_driver = {
+	.name = "intel_vsec",
+	.id_table = intel_vsec_pci_ids,
+	.probe = intel_vsec_pci_probe,
+};
+module_pci_driver(intel_vsec_pci_driver);
+
+MODULE_AUTHOR("David E. Box <[e-mail]>");
+MODULE_DESCRIPTION("Intel Extended Capabilities auxiliary bus driver");
+MODULE_LICENSE("GPL v2");

drivers/platform/x86/intel/vsec.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _VSEC_H
+#define _VSEC_H
+
+#include <linux/auxiliary_bus.h>
+#include <linux/bits.h>
+
+struct pci_dev;
+struct resource;
+
+enum intel_vsec_quirks {
+	/* Watcher feature not supported */
+	VSEC_QUIRK_NO_WATCHER	= BIT(0),
+
+	/* Crashlog feature not supported */
+	VSEC_QUIRK_NO_CRASHLOG	= BIT(1),
+
+	/* Use shift instead of mask to read discovery table offset */
+	VSEC_QUIRK_TABLE_SHIFT	= BIT(2),
+
+	/* DVSEC not present (provided in driver data) */
+	VSEC_QUIRK_NO_DVSEC	= BIT(3),
+};
+
+struct intel_vsec_device {
+	struct auxiliary_device auxdev;
+	struct pci_dev *pcidev;
+	struct resource *resource;
+	struct ida *ida;
+	unsigned long quirks;
+	int num_resources;
+};
+
+static inline struct intel_vsec_device *dev_to_ivdev(struct device *dev)
+{
+	return container_of(dev, struct intel_vsec_device, auxdev.dev);
+}
+
+static inline struct intel_vsec_device *auxdev_to_ivdev(struct auxiliary_device *auxdev)
+{
+	return container_of(auxdev, struct intel_vsec_device, auxdev);
+}
+#endif

drivers/soundwire/intel.c

···
 	bus->ops = &sdw_intel_ops;
 
 	/* set driver data, accessed by snd_soc_dai_get_drvdata() */
-	dev_set_drvdata(dev, cdns);
+	auxiliary_set_drvdata(auxdev, cdns);
 
 	/* use generic bandwidth allocation algorithm */
 	sdw->cdns.bus.compute_params = sdw_compute_params;
···
 {
 	struct sdw_cdns_stream_config config;
 	struct device *dev = &auxdev->dev;
-	struct sdw_cdns *cdns = dev_get_drvdata(dev);
+	struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
 	struct sdw_intel *sdw = cdns_to_intel(cdns);
 	struct sdw_bus *bus = &cdns->bus;
 	int link_flags;
···
 static void intel_link_remove(struct auxiliary_device *auxdev)
 {
 	struct device *dev = &auxdev->dev;
-	struct sdw_cdns *cdns = dev_get_drvdata(dev);
+	struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
 	struct sdw_intel *sdw = cdns_to_intel(cdns);
 	struct sdw_bus *bus = &cdns->bus;
 
···
 	void __iomem *shim;
 	u16 wake_sts;
 
-	sdw = dev_get_drvdata(dev);
+	sdw = auxiliary_get_drvdata(auxdev);
 	bus = &sdw->cdns.bus;
 
 	if (bus->prop.hw_disabled || !sdw->startup_done) {

drivers/soundwire/intel_init.c

···
 			goto err;
 
 		link = &ldev->link_res;
-		link->cdns = dev_get_drvdata(&ldev->auxdev.dev);
+		link->cdns = auxiliary_get_drvdata(&ldev->auxdev);
 
 		if (!link->cdns) {
 			dev_err(&adev->dev, "failed to get link->cdns\n");

drivers/vdpa/mlx5/net/mlx5_vnet.c

···
 	if (err)
 		goto reg_err;
 
-	dev_set_drvdata(&adev->dev, mgtdev);
+	auxiliary_set_drvdata(adev, mgtdev);
 
 	return 0;
 
···
 {
 	struct mlx5_vdpa_mgmtdev *mgtdev;
 
-	mgtdev = dev_get_drvdata(&adev->dev);
+	mgtdev = auxiliary_get_drvdata(adev);
 	vdpa_mgmtdev_unregister(&mgtdev->mgtdev);
 	kfree(mgtdev);
 }

fs/debugfs/file.c

···
 			       struct file *filp,
 			       const struct file_operations *real_fops)
 {
-	if ((inode->i_mode & 07777) == 0444 &&
+	if ((inode->i_mode & 07777 & ~0444) == 0 &&
 	    !(filp->f_mode & FMODE_WRITE) &&
 	    !real_fops->unlocked_ioctl &&
 	    !real_fops->compat_ioctl &&

fs/dlm/lockspace.c

···
 	return ls->ls_uevent_result;
 }
 
-static int dlm_uevent(struct kset *kset, struct kobject *kobj,
-		      struct kobj_uevent_env *env)
+static int dlm_uevent(struct kobject *kobj, struct kobj_uevent_env *env)
 {
 	struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
 

fs/gfs2/sys.c

···
 	wait_for_completion(&sdp->sd_kobj_unregister);
 }
 
-static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
-		       struct kobj_uevent_env *env)
+static int gfs2_uevent(struct kobject *kobj, struct kobj_uevent_env *env)
 {
 	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 	struct super_block *s = sdp->sd_vfs;

fs/kernfs/dir.c

···
 
 #include "kernfs-internal.h"
 
-DECLARE_RWSEM(kernfs_rwsem);
 static DEFINE_SPINLOCK(kernfs_rename_lock);	/* kn->parent and ->name */
 static char kernfs_pr_cont_buf[PATH_MAX];	/* protected by rename_lock */
 static DEFINE_SPINLOCK(kernfs_idr_lock);	/* root->ino_idr */
···
 
 static bool kernfs_active(struct kernfs_node *kn)
 {
-	lockdep_assert_held(&kernfs_rwsem);
+	lockdep_assert_held(&kernfs_root(kn)->kernfs_rwsem);
 	return atomic_read(&kn->active) >= 0;
 }
 
···
  * return after draining is complete.
  */
 static void kernfs_drain(struct kernfs_node *kn)
-	__releases(&kernfs_rwsem) __acquires(&kernfs_rwsem)
+	__releases(&kernfs_root(kn)->kernfs_rwsem)
+	__acquires(&kernfs_root(kn)->kernfs_rwsem)
 {
 	struct kernfs_root *root = kernfs_root(kn);
 
-	lockdep_assert_held_write(&kernfs_rwsem);
+	lockdep_assert_held_write(&root->kernfs_rwsem);
 	WARN_ON_ONCE(kernfs_active(kn));
 
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 
 	if (kernfs_lockdep(kn)) {
 		rwsem_acquire(&kn->dep_map, 0, 0, _RET_IP_);
···
 
 	kernfs_drain_open_files(kn);
 
-	down_write(&kernfs_rwsem);
+	down_write(&root->kernfs_rwsem);
 }
 
 /**
···
 int kernfs_add_one(struct kernfs_node *kn)
 {
 	struct kernfs_node *parent = kn->parent;
+	struct kernfs_root *root = kernfs_root(parent);
 	struct kernfs_iattrs *ps_iattr;
 	bool has_ns;
 	int ret;
 
-	down_write(&kernfs_rwsem);
+	down_write(&root->kernfs_rwsem);
 
 	ret = -EINVAL;
 	has_ns = kernfs_ns_enabled(parent);
···
 		ps_iattr->ia_mtime = ps_iattr->ia_ctime;
 	}
 
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 
 	/*
 	 * Activate the new node unless CREATE_DEACTIVATED is requested.
···
 	return 0;
 
 out_unlock:
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 	return ret;
 }
 
···
 	bool has_ns = kernfs_ns_enabled(parent);
 	unsigned int hash;
 
-	lockdep_assert_held(&kernfs_rwsem);
+	lockdep_assert_held(&kernfs_root(parent)->kernfs_rwsem);
 
 	if (has_ns != (bool)ns) {
 		WARN(1, KERN_WARNING "kernfs: ns %s in '%s' for '%s'\n",
···
 	size_t len;
 	char *p, *name;
 
-	lockdep_assert_held_read(&kernfs_rwsem);
+	lockdep_assert_held_read(&kernfs_root(parent)->kernfs_rwsem);
 
 	/* grab kernfs_rename_lock to piggy back on kernfs_pr_cont_buf */
 	spin_lock_irq(&kernfs_rename_lock);
···
 					   const char *name, const void *ns)
 {
 	struct kernfs_node *kn;
+	struct kernfs_root *root = kernfs_root(parent);
 
-	down_read(&kernfs_rwsem);
+	down_read(&root->kernfs_rwsem);
 	kn = kernfs_find_ns(parent, name, ns);
 	kernfs_get(kn);
-	up_read(&kernfs_rwsem);
+	up_read(&root->kernfs_rwsem);
 
 	return kn;
 }
···
 					   const char *path, const void *ns)
 {
 	struct kernfs_node *kn;
+	struct kernfs_root *root = kernfs_root(parent);
 
-	down_read(&kernfs_rwsem);
+	down_read(&root->kernfs_rwsem);
 	kn = kernfs_walk_ns(parent, path, ns);
 	kernfs_get(kn);
-	up_read(&kernfs_rwsem);
+	up_read(&root->kernfs_rwsem);
 
 	return kn;
 }
···
 		return ERR_PTR(-ENOMEM);
 
 	idr_init(&root->ino_idr);
+	init_rwsem(&root->kernfs_rwsem);
 	INIT_LIST_HEAD(&root->supers);
 
 	/*
···
  */
 void kernfs_destroy_root(struct kernfs_root *root)
 {
-	kernfs_remove(root->kn);	/* will also free @root */
+	/*
+	 *  kernfs_remove holds kernfs_rwsem from the root so the root
+	 *  shouldn't be freed during the operation.
+	 */
+	kernfs_get(root->kn);
+	kernfs_remove(root->kn);
+	kernfs_put(root->kn); /* will also free @root */
 }
 
 /**
···
 static int kernfs_dop_revalidate(struct dentry *dentry, unsigned int flags)
 {
 	struct kernfs_node *kn;
+	struct kernfs_root *root;
 
 	if (flags & LOOKUP_RCU)
 		return -ECHILD;
···
 		/* If the kernfs parent node has changed discard and
 		 * proceed to ->lookup.
 		 */
-		down_read(&kernfs_rwsem);
 		spin_lock(&dentry->d_lock);
 		parent = kernfs_dentry_node(dentry->d_parent);
 		if (parent) {
+			spin_unlock(&dentry->d_lock);
+			root = kernfs_root(parent);
+			down_read(&root->kernfs_rwsem);
 			if (kernfs_dir_changed(parent, dentry)) {
-				spin_unlock(&dentry->d_lock);
-				up_read(&kernfs_rwsem);
+				up_read(&root->kernfs_rwsem);
 				return 0;
 			}
-		}
-		spin_unlock(&dentry->d_lock);
-		up_read(&kernfs_rwsem);
+			up_read(&root->kernfs_rwsem);
+		} else
+			spin_unlock(&dentry->d_lock);
 
 		/* The kernfs parent node hasn't changed, leave the
 		 * dentry negative and return success.
···
 	}
 
 	kn = kernfs_dentry_node(dentry);
-	down_read(&kernfs_rwsem);
+	root = kernfs_root(kn);
+	down_read(&root->kernfs_rwsem);
 
 	/* The kernfs node has been deactivated */
 	if (!kernfs_active(kn))
···
 	    kernfs_info(dentry->d_sb)->ns != kn->ns)
 		goto out_bad;
 
-	up_read(&kernfs_rwsem);
+	up_read(&root->kernfs_rwsem);
 	return 1;
 out_bad:
-	up_read(&kernfs_rwsem);
+	up_read(&root->kernfs_rwsem);
 	return 0;
 }
 
···
 {
 	struct kernfs_node *parent = dir->i_private;
 	struct kernfs_node *kn;
+	struct kernfs_root *root;
 	struct inode *inode = NULL;
 	const void *ns = NULL;
 
-	down_read(&kernfs_rwsem);
+	root = kernfs_root(parent);
+	down_read(&root->kernfs_rwsem);
 	if (kernfs_ns_enabled(parent))
 		ns = kernfs_info(dir->i_sb)->ns;
 
···
 		 * create a negative.
 		 */
 		if (!kernfs_active(kn)) {
-			up_read(&kernfs_rwsem);
+			up_read(&root->kernfs_rwsem);
 			return NULL;
 		}
 		inode = kernfs_get_inode(dir->i_sb, kn);
···
 	 */
 	if (!IS_ERR(inode))
 		kernfs_set_rev(parent, dentry);
-	up_read(&kernfs_rwsem);
+	up_read(&root->kernfs_rwsem);
 
 	/* instantiate and hash (possibly negative) dentry */
 	return d_splice_alias(inode, dentry);
···
 {
 	struct rb_node *rbn;
 
-	lockdep_assert_held_write(&kernfs_rwsem);
+	lockdep_assert_held_write(&kernfs_root(root)->kernfs_rwsem);
 
 	/* if first iteration, visit leftmost descendant which may be root */
 	if (!pos)
···
 void kernfs_activate(struct kernfs_node *kn)
 {
 	struct kernfs_node *pos;
+	struct kernfs_root *root = kernfs_root(kn);
 
-	down_write(&kernfs_rwsem);
+	down_write(&root->kernfs_rwsem);
 
 	pos = NULL;
 	while ((pos = kernfs_next_descendant_post(pos, kn))) {
···
 		pos->flags |= KERNFS_ACTIVATED;
 	}
 
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 }
 
 static void __kernfs_remove(struct kernfs_node *kn)
 {
 	struct kernfs_node *pos;
 
-	lockdep_assert_held_write(&kernfs_rwsem);
+	lockdep_assert_held_write(&kernfs_root(kn)->kernfs_rwsem);
 
 	/*
 	 * Short-circuit if non-root @kn has already finished removal.
···
  */
 void kernfs_remove(struct kernfs_node *kn)
 {
-	down_write(&kernfs_rwsem);
+	struct kernfs_root *root = kernfs_root(kn);
+
+	down_write(&root->kernfs_rwsem);
 	__kernfs_remove(kn);
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 }
 
 /**
···
 bool kernfs_remove_self(struct kernfs_node *kn)
 {
 	bool ret;
+	struct kernfs_root *root = kernfs_root(kn);
 
-	down_write(&kernfs_rwsem);
+	down_write(&root->kernfs_rwsem);
 	kernfs_break_active_protection(kn);
 
 	/*
···
 			    atomic_read(&kn->active) == KN_DEACTIVATED_BIAS)
 				break;
 
-			up_write(&kernfs_rwsem);
+			up_write(&root->kernfs_rwsem);
 			schedule();
-			down_write(&kernfs_rwsem);
+			down_write(&root->kernfs_rwsem);
 		}
 		finish_wait(waitq, &wait);
 		WARN_ON_ONCE(!RB_EMPTY_NODE(&kn->rb));
···
 	 */
 	kernfs_unbreak_active_protection(kn);
 
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 	return ret;
 }
 
···
 			     const void *ns)
 {
 	struct kernfs_node *kn;
+	struct kernfs_root *root;
 
 	if (!parent) {
 		WARN(1, KERN_WARNING "kernfs: can not remove '%s', no directory\n",
···
 		return -ENOENT;
 	}
 
-	down_write(&kernfs_rwsem);
+	root = kernfs_root(parent);
+	down_write(&root->kernfs_rwsem);
 
 	kn = kernfs_find_ns(parent, name, ns);
 	if (kn)
 		__kernfs_remove(kn);
 
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 
 	if (kn)
 		return 0;
···
 		     const char *new_name, const void *new_ns)
 {
 	struct kernfs_node *old_parent;
+	struct kernfs_root *root;
 	const char *old_name = NULL;
 	int error;
 
···
 	if (!kn->parent)
 		return -EINVAL;
 
-	down_write(&kernfs_rwsem);
+	root = kernfs_root(kn);
+	down_write(&root->kernfs_rwsem);
 
 	error = -ENOENT;
 	if (!kernfs_active(kn) || !kernfs_active(new_parent) ||
···
 
 	error = 0;
  out:
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 	return error;
 }
 
···
 	struct dentry *dentry = file->f_path.dentry;
 	struct kernfs_node *parent = kernfs_dentry_node(dentry);
 	struct kernfs_node *pos = file->private_data;
+	struct kernfs_root *root;
 	const void *ns = NULL;
 
 	if (!dir_emit_dots(file, ctx))
 		return 0;
-	down_read(&kernfs_rwsem);
+
+	root = kernfs_root(parent);
+	down_read(&root->kernfs_rwsem);
 
 	if (kernfs_ns_enabled(parent))
 		ns = kernfs_info(dentry->d_sb)->ns;
···
 		file->private_data = pos;
 		kernfs_get(pos);
 
-		up_read(&kernfs_rwsem);
+		up_read(&root->kernfs_rwsem);
 		if (!dir_emit(ctx, name, len, ino, type))
 			return 0;
-		down_read(&kernfs_rwsem);
+		down_read(&root->kernfs_rwsem);
 	}
-	up_read(&kernfs_rwsem);
+	up_read(&root->kernfs_rwsem);
 	file->private_data = NULL;
 	ctx->pos = INT_MAX;
 	return 0;

fs/kernfs/file.c

···
 {
 	struct kernfs_node *kn;
 	struct kernfs_super_info *info;
+	struct kernfs_root *root;
 repeat:
 	/* pop one off the notify_list */
 	spin_lock_irq(&kernfs_notify_lock);
···
 	kn->attr.notify_next = NULL;
 	spin_unlock_irq(&kernfs_notify_lock);
 
+	root = kernfs_root(kn);
 	/* kick fsnotify */
-	down_write(&kernfs_rwsem);
+	down_write(&root->kernfs_rwsem);
 
 	list_for_each_entry(info, &kernfs_root(kn)->supers, node) {
 		struct kernfs_node *parent;
···
 		iput(inode);
 	}
 
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 	kernfs_put(kn);
 	goto repeat;
 }

fs/kernfs/inode.c

···
 int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr)
 {
 	int ret;
+	struct kernfs_root *root = kernfs_root(kn);
 
-	down_write(&kernfs_rwsem);
+	down_write(&root->kernfs_rwsem);
 	ret = __kernfs_setattr(kn, iattr);
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 	return ret;
 }
 
···
 {
 	struct inode *inode = d_inode(dentry);
 	struct kernfs_node *kn = inode->i_private;
+	struct kernfs_root *root;
 	int error;
 
 	if (!kn)
 		return -EINVAL;
 
-	down_write(&kernfs_rwsem);
+	root = kernfs_root(kn);
+	down_write(&root->kernfs_rwsem);
 	error = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (error)
 		goto out;
···
 	setattr_copy(&init_user_ns, inode, iattr);
 
 out:
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 	return error;
 }
 
···
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct kernfs_node *kn = inode->i_private;
+	struct kernfs_root *root = kernfs_root(kn);
 
-	down_read(&kernfs_rwsem);
+	down_read(&root->kernfs_rwsem);
 	spin_lock(&inode->i_lock);
 	kernfs_refresh_inode(kn, inode);
 	generic_fillattr(&init_user_ns, inode, stat);
 	spin_unlock(&inode->i_lock);
-	up_read(&kernfs_rwsem);
+	up_read(&root->kernfs_rwsem);
 
 	return 0;
 }
···
 			  struct inode *inode, int mask)
 {
 	struct kernfs_node *kn;
+	struct kernfs_root *root;
 	int ret;
 
 	if (mask & MAY_NOT_BLOCK)
 		return -ECHILD;
 
 	kn = inode->i_private;
+	root = kernfs_root(kn);
 
-	down_read(&kernfs_rwsem);
+	down_read(&root->kernfs_rwsem);
 	spin_lock(&inode->i_lock);
 	kernfs_refresh_inode(kn, inode);
 	ret = generic_permission(&init_user_ns, inode, mask);
 	spin_unlock(&inode->i_lock);
-	up_read(&kernfs_rwsem);
+	up_read(&root->kernfs_rwsem);
 
 	return ret;
 }

fs/kernfs/mount.c

···
 static int kernfs_fill_super(struct super_block *sb, struct kernfs_fs_context *kfc)
 {
 	struct kernfs_super_info *info = kernfs_info(sb);
+	struct kernfs_root *kf_root = kfc->root;
 	struct inode *inode;
 	struct dentry *root;
 
···
 	sb->s_shrink.seeks = 0;
 
 	/* get root inode, initialize and unlock it */
-	down_read(&kernfs_rwsem);
+	down_read(&kf_root->kernfs_rwsem);
 	inode = kernfs_get_inode(sb, info->root->kn);
-	up_read(&kernfs_rwsem);
+	up_read(&kf_root->kernfs_rwsem);
 	if (!inode) {
 		pr_debug("kernfs: could not get root inode\n");
 		return -ENOMEM;
···
 
 	if (!sb->s_root) {
 		struct kernfs_super_info *info = kernfs_info(sb);
+		struct kernfs_root *root = kfc->root;
 
 		kfc->new_sb_created = true;
 
···
 		}
 		sb->s_flags |= SB_ACTIVE;
 
-		down_write(&kernfs_rwsem);
+		down_write(&root->kernfs_rwsem);
 		list_add(&info->node, &info->root->supers);
-		up_write(&kernfs_rwsem);
+		up_write(&root->kernfs_rwsem);
 	}
 
 	fc->root = dget(sb->s_root);
···
 void kernfs_kill_sb(struct super_block *sb)
 {
 	struct kernfs_super_info *info = kernfs_info(sb);
+	struct kernfs_root *root = info->root;
 
-	down_write(&kernfs_rwsem);
+	down_write(&root->kernfs_rwsem);
 	list_del(&info->node);
-	up_write(&kernfs_rwsem);
+	up_write(&root->kernfs_rwsem);
 
 	/*
 	 * Remove the superblock from fs_supers/s_instances

fs/kernfs/symlink.c

···
 	struct kernfs_node *kn = inode->i_private;
 	struct kernfs_node *parent = kn->parent;
 	struct kernfs_node *target = kn->symlink.target_kn;
+	struct kernfs_root *root = kernfs_root(parent);
 	int error;
 
-	down_read(&kernfs_rwsem);
+	down_read(&root->kernfs_rwsem);
 	error = kernfs_get_target_path(parent, target, path);
-	up_read(&kernfs_rwsem);
+	up_read(&root->kernfs_rwsem);
 
 	return error;
 }

fs/nilfs2/sysfs.c

···
 	complete(&subgroups->sg_##name##_kobj_unregister); \
 } \
 static struct kobj_type nilfs_##name##_ktype = { \
-	.default_attrs	= nilfs_##name##_attrs, \
+	.default_groups	= nilfs_##name##_groups, \
 	.sysfs_ops	= &nilfs_##name##_attr_ops, \
 	.release	= nilfs_##name##_attr_release, \
 }
···
 	NILFS_SNAPSHOT_ATTR_LIST(README),
 	NULL,
 };
+ATTRIBUTE_GROUPS(nilfs_snapshot);
 
 static ssize_t nilfs_snapshot_attr_show(struct kobject *kobj,
 					struct attribute *attr, char *buf)
···
 };
 
 static struct kobj_type nilfs_snapshot_ktype = {
-	.default_attrs	= nilfs_snapshot_attrs,
+	.default_groups	= nilfs_snapshot_groups,
 	.sysfs_ops	= &nilfs_snapshot_attr_ops,
 	.release	= nilfs_snapshot_attr_release,
 };
···
 	NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(README),
 	NULL,
 };
+ATTRIBUTE_GROUPS(nilfs_mounted_snapshots);
 
 NILFS_DEV_INT_GROUP_OPS(mounted_snapshots, dev);
 NILFS_DEV_INT_GROUP_TYPE(mounted_snapshots, dev);
···
 	NILFS_CHECKPOINTS_ATTR_LIST(README),
 	NULL,
 };
+ATTRIBUTE_GROUPS(nilfs_checkpoints);
 
 NILFS_DEV_INT_GROUP_OPS(checkpoints, dev);
 NILFS_DEV_INT_GROUP_TYPE(checkpoints, dev);
···
 	NILFS_SEGMENTS_ATTR_LIST(README),
 	NULL,
 };
+ATTRIBUTE_GROUPS(nilfs_segments);
 
 NILFS_DEV_INT_GROUP_OPS(segments, dev);
 NILFS_DEV_INT_GROUP_TYPE(segments, dev);
···
 	NILFS_SEGCTOR_ATTR_LIST(README),
 	NULL,
 };
+ATTRIBUTE_GROUPS(nilfs_segctor);
 
 NILFS_DEV_INT_GROUP_OPS(segctor, dev);
 NILFS_DEV_INT_GROUP_TYPE(segctor, dev);
···
 	NILFS_SUPERBLOCK_ATTR_LIST(README),
 	NULL,
 };
+ATTRIBUTE_GROUPS(nilfs_superblock);
 
 NILFS_DEV_INT_GROUP_OPS(superblock, dev);
 NILFS_DEV_INT_GROUP_TYPE(superblock, dev);
···
 	NILFS_DEV_ATTR_LIST(README),
 	NULL,
 };
+ATTRIBUTE_GROUPS(nilfs_dev);
 
 static ssize_t nilfs_dev_attr_show(struct kobject *kobj,
 				    struct attribute *attr, char *buf)
···
 };
 
 static struct kobj_type nilfs_dev_ktype = {
-	.default_attrs	= nilfs_dev_attrs,
+	.default_groups	= nilfs_dev_groups,
 	.sysfs_ops	= &nilfs_dev_attr_ops,
 	.release	= nilfs_dev_attr_release,
 };

include/linux/auxiliary_bus.h

···
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
 
+/**
+ * DOC: DEVICE_LIFESPAN
+ *
+ * The registering driver is the entity that allocates memory for the
+ * auxiliary_device and registers it on the auxiliary bus.  It is important to
+ * note that, as opposed to the platform bus, the registering driver is wholly
+ * responsible for the management of the memory used for the device object.
+ *
+ * To be clear the memory for the auxiliary_device is freed in the release()
+ * callback defined by the registering driver.  The registering driver should
+ * only call auxiliary_device_delete() and then auxiliary_device_uninit() when
+ * it is done with the device.  The release() function is then automatically
+ * called if and when other code releases their reference to the devices.
+ *
+ * A parent object, defined in the shared header file, contains the
+ * auxiliary_device.  It also contains a pointer to the shared object(s), which
+ * also is defined in the shared header.  Both the parent object and the shared
+ * object(s) are allocated by the registering driver.  This layout allows the
+ * auxiliary_driver's registering module to perform a container_of() call to go
+ * from the pointer to the auxiliary_device, that is passed during the call to
+ * the auxiliary_driver's probe function, up to the parent object, and then
+ * have access to the shared object(s).
+ *
+ * The memory for the shared object(s) must have a lifespan equal to, or
+ * greater than, the lifespan of the memory for the auxiliary_device.  The
+ * auxiliary_driver should only consider that the shared object is valid as
+ * long as the auxiliary_device is still registered on the auxiliary bus.  It
+ * is up to the registering driver to manage (e.g. free or keep available) the
+ * memory for the shared object beyond the life of the auxiliary_device.
+ *
+ * The registering driver must unregister all auxiliary devices before its own
+ * driver.remove() is completed.  An easy way to ensure this is to use the
+ * devm_add_action_or_reset() call to register a function against the parent
+ * device which unregisters the auxiliary device object(s).
+ *
+ * Finally, any operations which operate on the auxiliary devices must continue
+ * to function (if only to return an error) after the registering driver
+ * unregisters the auxiliary device.
+ */
+
+/**
+ * struct auxiliary_device - auxiliary device object.
+ * @dev: Device,
+ *       The release and parent fields of the device structure must be filled
+ *       in
+ * @name: Match name found by the auxiliary device driver,
+ * @id: unique identitier if multiple devices of the same name are exported,
+ *
+ * An auxiliary_device represents a part of its parent device's functionality.
+ * It is given a name that, combined with the registering drivers
+ * KBUILD_MODNAME, creates a match_name that is used for driver binding, and an
+ * id that combined with the match_name provide a unique name to register with
+ * the bus subsystem.  For example, a driver registering an auxiliary device is
+ * named 'foo_mod.ko' and the subdevice is named 'foo_dev'.  The match name is
+ * therefore 'foo_mod.foo_dev'.
+ *
+ * Registering an auxiliary_device is a three-step process.
+ *
+ * First, a 'struct auxiliary_device' needs to be defined or allocated for each
+ * sub-device desired.  The name, id, dev.release, and dev.parent fields of
+ * this structure must be filled in as follows.
+ *
+ * The 'name' field is to be given a name that is recognized by the auxiliary
+ * driver.  If two auxiliary_devices with the same match_name, eg
+ * "foo_mod.foo_dev", are registered onto the bus, they must have unique id
+ * values (e.g. "x" and "y") so that the registered devices names are
+ * "foo_mod.foo_dev.x" and "foo_mod.foo_dev.y".  If match_name + id are not
+ * unique, then the device_add fails and generates an error message.
+ *
+ * The auxiliary_device.dev.type.release or auxiliary_device.dev.release must
+ * be populated with a non-NULL pointer to successfully register the
+ * auxiliary_device.  This release call is where resources associated with the
+ * auxiliary device must be free'ed.  Because once the device is placed on the
+ * bus the parent driver can not tell what other code may have a reference to
+ * this data.
+ *
+ * The auxiliary_device.dev.parent should be set.  Typically to the registering
+ * drivers device.
+ *
+ * Second, call auxiliary_device_init(), which checks several aspects of the
+ * auxiliary_device struct and performs a device_initialize().  After this step
+ * completes, any error state must have a call to auxiliary_device_uninit() in
+ * its resolution path.
+ *
+ * The third and final step in registering an auxiliary_device is to perform a
+ * call to auxiliary_device_add(), which sets the name of the device and adds
+ * the device to the bus.
+ *
+ * .. code-block:: c
+ *
+ *      #define MY_DEVICE_NAME "foo_dev"
+ *
+ *      ...
+ *
+ *	struct auxiliary_device *my_aux_dev = my_aux_dev_alloc(xxx);
+ *
+ *	// Step 1:
+ *	my_aux_dev->name = MY_DEVICE_NAME;
+ *	my_aux_dev->id = my_unique_id_alloc(xxx);
+ *	my_aux_dev->dev.release = my_aux_dev_release;
+ *	my_aux_dev->dev.parent = my_dev;
+ *
+ *	// Step 2:
+ *	if (auxiliary_device_init(my_aux_dev))
+ *		goto fail;
+ *
+ *	// Step 3:
+ *	if (auxiliary_device_add(my_aux_dev)) {
+ *		auxiliary_device_uninit(my_aux_dev);
+ *		goto fail;
+ *	}
+ *
+ *	...
+ *
+ *
+ * Unregistering an auxiliary_device is a two-step process to mirror the
+ * register process.  First call auxiliary_device_delete(), then call
+ * auxiliary_device_uninit().
+ *
+ * .. code-block:: c
+ *
+ *         auxiliary_device_delete(my_dev->my_aux_dev);
+ *         auxiliary_device_uninit(my_dev->my_aux_dev);
+ */
 struct auxiliary_device {
 	struct device dev;
 	const char *name;
 	u32 id;
 };
 
+/**
+ * struct auxiliary_driver - Definition of an auxiliary bus driver
+ * @probe: Called when a matching device is added to the bus.
+ * @remove: Called when device is removed from the bus.
+ * @shutdown: Called at shut-down time to quiesce the device.
+ * @suspend: Called to put the device to sleep mode. Usually to a power state.
+ * @resume: Called to bring a device from sleep mode.
+ * @name: Driver name.
+ * @driver: Core driver structure.
+ * @id_table: Table of devices this driver should match on the bus.
+ *
+ * Auxiliary drivers follow the standard driver model convention, where
+ * discovery/enumeration is handled by the core, and drivers provide probe()
+ * and remove() methods. They support power management and shutdown
+ * notifications using the standard conventions.
+ *
+ * Auxiliary drivers register themselves with the bus by calling
+ * auxiliary_driver_register(). The id_table contains the match_names of
+ * auxiliary devices that a driver can bind with.
+ *
+ * .. code-block:: c
+ *
+ *         static const struct auxiliary_device_id my_auxiliary_id_table[] = {
+ *		   { .name = "foo_mod.foo_dev" },
+ *                 {},
+ *         };
+ *
+ *         MODULE_DEVICE_TABLE(auxiliary, my_auxiliary_id_table);
+ *
+ *         struct auxiliary_driver my_drv = {
+ *                 .name = "myauxiliarydrv",
+ *                 .id_table = my_auxiliary_id_table,
+ *                 .probe = my_drv_probe,
+ *                 .remove = my_drv_remove
+ *         };
+ */
 struct auxiliary_driver {
 	int (*probe)(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id);
 	void (*remove)(struct auxiliary_device *auxdev);
···
 	struct device_driver driver;
 	const struct auxiliary_device_id *id_table;
 };
+
+static inline void *auxiliary_get_drvdata(struct auxiliary_device *auxdev)
+{
+	return dev_get_drvdata(&auxdev->dev);
+}
+
+static inline void auxiliary_set_drvdata(struct auxiliary_device *auxdev, void *data)
+{
+	dev_set_drvdata(&auxdev->dev, data);
+}
 
 static inline struct auxiliary_device *to_auxiliary_dev(struct device *dev)
 {
···
  * Helper macro for auxiliary drivers which do not do anything special in
  * module init/exit. This eliminates a lot of boilerplate. Each module may only
  * use this macro once, and calling it replaces module_init() and module_exit()
+ *
+ * .. code-block:: c
+ *
+ *	module_auxiliary_driver(my_drv);
  */
 #define module_auxiliary_driver(__auxiliary_driver) \
 	module_driver(__auxiliary_driver, auxiliary_driver_register, auxiliary_driver_unregister)

include/linux/kernfs.h

···
 #ifndef __LINUX_KERNFS_H
 #define __LINUX_KERNFS_H
 
-#include <linux/kernel.h>
 #include <linux/err.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
···
 #include <linux/lockdep.h>
 #include <linux/rbtree.h>
 #include <linux/atomic.h>
+#include <linux/bug.h>
+#include <linux/types.h>
 #include <linux/uidgid.h>
 #include <linux/wait.h>
+#include <linux/rwsem.h>
 
 struct file;
 struct dentry;
 struct iattr;
 struct seq_file;
 struct vm_area_struct;
+struct vm_operations_struct;
 struct super_block;
 struct file_system_type;
 struct poll_table_struct;
···
 	struct list_head	supers;
 
 	wait_queue_head_t	deactivate_waitq;
+	struct rw_semaphore	kernfs_rwsem;
 };
 
 struct kernfs_open_file {

include/linux/kobject.h

···
 #include <linux/list.h>
 #include <linux/sysfs.h>
 #include <linux/compiler.h>
+#include <linux/container_of.h>
 #include <linux/spinlock.h>
 #include <linux/kref.h>
 #include <linux/kobject_ns.h>
-#include <linux/kernel.h>
 #include <linux/wait.h>
 #include <linux/atomic.h>
 #include <linux/workqueue.h>
···
 	struct list_head	entry;
 	struct kobject		*parent;
 	struct kset		*kset;
-	struct kobj_type	*ktype;
+	const struct kobj_type	*ktype;
 	struct kernfs_node	*sd; /* sysfs directory entry */
 	struct kref		kref;
 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
···
 	return kobj->name;
 }
 
-extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype);
+extern void kobject_init(struct kobject *kobj, const struct kobj_type *ktype);
 extern __printf(3, 4) __must_check
 int kobject_add(struct kobject *kobj, struct kobject *parent,
 		const char *fmt, ...);
 extern __printf(4, 5) __must_check
 int kobject_init_and_add(struct kobject *kobj,
-			 struct kobj_type *ktype, struct kobject *parent,
+			 const struct kobj_type *ktype, struct kobject *parent,
 			 const char *fmt, ...);
 
 extern void kobject_del(struct kobject *kobj);
···
 				  kuid_t *uid, kgid_t *gid);
 extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
 
-/**
- * kobject_has_children - Returns whether a kobject has children.
- * @kobj: the object to test
- *
- * This will return whether a kobject has other kobjects as children.
- *
- * It does NOT account for the presence of attribute files, only sub
- * directories. It also assumes there is no concurrent addition or
- * removal of such children, and thus relies on external locking.
- */
-static inline bool kobject_has_children(struct kobject *kobj)
-{
-	WARN_ON_ONCE(kref_read(&kobj->kref) == 0);
-
-	return kobj->sd && kobj->sd->dir.subdirs;
-}
-
 struct kobj_type {
 	void (*release)(struct kobject *kobj);
 	const struct sysfs_ops *sysfs_ops;
···
 };
 
 struct kset_uevent_ops {
-	int (* const filter)(struct kset *kset, struct kobject *kobj);
-	const char *(* const name)(struct kset *kset, struct kobject *kobj);
-	int (* const uevent)(struct kset *kset, struct kobject *kobj,
-		      struct kobj_uevent_env *env);
+	int (* const filter)(struct kobject *kobj);
+	const char *(* const name)(struct kobject *kobj);
+	int (* const uevent)(struct kobject *kobj, struct kobj_uevent_env *env);
 };
 
 struct kobj_attribute {
···
 	kobject_put(&k->kobj);
 }
 
-static inline struct kobj_type *get_ktype(struct kobject *kobj)
+static inline const struct kobj_type *get_ktype(struct kobject *kobj)
 {
 	return kobj->ktype;
 }

include/linux/topology.h

···
 
 #endif	/* [!]CONFIG_HAVE_MEMORYLESS_NODES */
 
+#if defined(topology_die_id) && defined(topology_die_cpumask)
+#define TOPOLOGY_DIE_SYSFS
+#endif
+#if defined(topology_cluster_id) && defined(topology_cluster_cpumask)
+#define TOPOLOGY_CLUSTER_SYSFS
+#endif
+#if defined(topology_book_id) && defined(topology_book_cpumask)
+#define TOPOLOGY_BOOK_SYSFS
+#endif
+#if defined(topology_drawer_id) && defined(topology_drawer_cpumask)
+#define TOPOLOGY_DRAWER_SYSFS
+#endif
+
 #ifndef topology_physical_package_id
 #define topology_physical_package_id(cpu)	((void)(cpu), -1)
 #endif
···
 #ifndef topology_core_id
 #define topology_core_id(cpu)			((void)(cpu), 0)
 #endif
+#ifndef topology_book_id
+#define topology_book_id(cpu)			((void)(cpu), -1)
+#endif
+#ifndef topology_drawer_id
+#define topology_drawer_id(cpu)			((void)(cpu), -1)
+#endif
 #ifndef topology_sibling_cpumask
 #define topology_sibling_cpumask(cpu)		cpumask_of(cpu)
 #endif
···
 #endif
 #ifndef topology_die_cpumask
 #define topology_die_cpumask(cpu)		cpumask_of(cpu)
+#endif
+#ifndef topology_book_cpumask
+#define topology_book_cpumask(cpu)		cpumask_of(cpu)
+#endif
+#ifndef topology_drawer_cpumask
+#define topology_drawer_cpumask(cpu)		cpumask_of(cpu)
 #endif
 
 #if defined(CONFIG_SCHED_SMT) && !defined(cpu_smt_mask)

include/uapi/linux/pci_regs.h

···
 
 /* Designated Vendor-Specific (DVSEC, PCI_EXT_CAP_ID_DVSEC) */
 #define PCI_DVSEC_HEADER1		0x4 /* Designated Vendor-Specific Header1 */
+#define  PCI_DVSEC_HEADER1_VID(x)	((x) & 0xffff)
+#define  PCI_DVSEC_HEADER1_REV(x)	(((x) >> 16) & 0xf)
+#define  PCI_DVSEC_HEADER1_LEN(x)	(((x) >> 20) & 0xfff)
 #define PCI_DVSEC_HEADER2		0x8 /* Designated Vendor-Specific Header2 */
+#define  PCI_DVSEC_HEADER2_ID(x)		((x) & 0xffff)
 
 /* Data Link Feature */
 #define PCI_DLF_CAP		0x04	/* Capabilities Register */

kernel/params.c

···
 	.store = module_attr_store,
 };
 
-static int uevent_filter(struct kset *kset, struct kobject *kobj)
+static int uevent_filter(struct kobject *kobj)
 {
-	struct kobj_type *ktype = get_ktype(kobj);
+	const struct kobj_type *ktype = get_ktype(kobj);
 
 	if (ktype == &module_ktype)
 		return 1;

lib/kobject.c

···
  */
 static int populate_dir(struct kobject *kobj)
 {
-	struct kobj_type *t = get_ktype(kobj);
+	const struct kobj_type *t = get_ktype(kobj);
 	struct attribute *attr;
 	int error = 0;
 	int i;
···
  * to kobject_put(), not by a call to kfree directly to ensure that all of
  * the memory is cleaned up properly.
  */
-void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
+void kobject_init(struct kobject *kobj, const struct kobj_type *ktype)
 {
 	char *err_str;
 
···
  * same type of error handling after a call to kobject_add() and kobject
  * lifetime rules are the same here.
  */
-int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
+int kobject_init_and_add(struct kobject *kobj, const struct kobj_type *ktype,
 			 struct kobject *parent, const char *fmt, ...)
 {
 	va_list args;
···
 static void kobject_cleanup(struct kobject *kobj)
 {
 	struct kobject *parent = kobj->parent;
-	struct kobj_type *t = get_ktype(kobj);
+	const struct kobj_type *t = get_ktype(kobj);
 	const char *name = kobj->name;
 
 	pr_debug("kobject: '%s' (%p): %s, parent %p\n",

lib/kobject_uevent.c

···
 	}
 	/* skip the event, if the filter returns zero. */
 	if (uevent_ops && uevent_ops->filter)
-		if (!uevent_ops->filter(kset, kobj)) {
+		if (!uevent_ops->filter(kobj)) {
 			pr_debug("kobject: '%s' (%p): %s: filter function "
 				 "caused the event to drop!\n",
 				 kobject_name(kobj), kobj, __func__);
···
 
 	/* originating subsystem */
 	if (uevent_ops && uevent_ops->name)
-		subsystem = uevent_ops->name(kset, kobj);
+		subsystem = uevent_ops->name(kobj);
 	else
 		subsystem = kobject_name(&kset->kobj);
 	if (!subsystem) {
···
 
 	/* let the kset specific function add its stuff */
 	if (uevent_ops && uevent_ops->uevent) {
-		retval = uevent_ops->uevent(kset, kobj, env);
+		retval = uevent_ops->uevent(kobj, env);
 		if (retval) {
 			pr_debug("kobject: '%s' (%p): %s: uevent() returned "
 				 "%d\n", kobject_name(kobj), kobj,