Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 529 insertions, 0 deletions

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
new file mode 100644
index 000000000..ee5007064
--- /dev/null
+++ b/include/net/switchdev.h
@@ -0,0 +1,529 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * include/net/switchdev.h - Switch device API
+ * Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us>
+ * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
+ */
+#ifndef _LINUX_SWITCHDEV_H_
+#define _LINUX_SWITCHDEV_H_
+
+#include <linux/netdevice.h>
+#include <linux/notifier.h>
+#include <linux/list.h>
+#include <net/ip_fib.h>
+
+#define SWITCHDEV_F_NO_RECURSE		BIT(0)
+#define SWITCHDEV_F_SKIP_EOPNOTSUPP	BIT(1)
+#define SWITCHDEV_F_DEFER		BIT(2)
+#define SWITCHDEV_F_NO_FOREIGN		BIT(3)
+
+enum switchdev_attr_id {
+	SWITCHDEV_ATTR_ID_UNDEFINED,
+	SWITCHDEV_ATTR_ID_PORT_STP_STATE,
+	SWITCHDEV_ATTR_ID_PORT_MST_STATE,
+	SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
+	SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS,
+	SWITCHDEV_ATTR_ID_PORT_MROUTER,
+	SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
+	SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
+	SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL,
+	SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
+	SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
+	SWITCHDEV_ATTR_ID_BRIDGE_MST,
+	SWITCHDEV_ATTR_ID_MRP_PORT_ROLE,
+	SWITCHDEV_ATTR_ID_VLAN_MSTI,
+};
+
+struct switchdev_mst_state {
+	u16 msti;
+	u8 state;
+};
+
+struct switchdev_brport_flags {
+	unsigned long val;
+	unsigned long mask;
+};
+
+struct switchdev_vlan_msti {
+	u16 vid;
+	u16 msti;
+};
+
+struct switchdev_attr {
+	struct net_device *orig_dev;
+	enum switchdev_attr_id id;
+	u32 flags;
+	void *complete_priv;
+	void (*complete)(struct net_device *dev, int err, void *priv);
+	union {
+		u8 stp_state;				/* PORT_STP_STATE */
+		struct switchdev_mst_state mst_state;	/* PORT_MST_STATE */
+		struct switchdev_brport_flags brport_flags; /* PORT_BRIDGE_FLAGS */
+		bool mrouter;				/* PORT_MROUTER */
+		clock_t ageing_time;			/* BRIDGE_AGEING_TIME */
+		bool vlan_filtering;			/* BRIDGE_VLAN_FILTERING */
+		u16 vlan_protocol;			/* BRIDGE_VLAN_PROTOCOL */
+		bool mst;				/* BRIDGE_MST */
+		bool mc_disabled;			/* MC_DISABLED */
+		u8 mrp_port_role;			/* MRP_PORT_ROLE */
+		struct switchdev_vlan_msti vlan_msti;	/* VLAN_MSTI */
+	} u;
+};
+
+enum switchdev_obj_id {
+	SWITCHDEV_OBJ_ID_UNDEFINED,
+	SWITCHDEV_OBJ_ID_PORT_VLAN,
+	SWITCHDEV_OBJ_ID_PORT_MDB,
+	SWITCHDEV_OBJ_ID_HOST_MDB,
+	SWITCHDEV_OBJ_ID_MRP,
+	SWITCHDEV_OBJ_ID_RING_TEST_MRP,
+	SWITCHDEV_OBJ_ID_RING_ROLE_MRP,
+	SWITCHDEV_OBJ_ID_RING_STATE_MRP,
+	SWITCHDEV_OBJ_ID_IN_TEST_MRP,
+	SWITCHDEV_OBJ_ID_IN_ROLE_MRP,
+	SWITCHDEV_OBJ_ID_IN_STATE_MRP,
+};
+
+struct switchdev_obj {
+	struct list_head list;
+	struct net_device *orig_dev;
+	enum switchdev_obj_id id;
+	u32 flags;
+	void *complete_priv;
+	void (*complete)(struct net_device *dev, int err, void *priv);
+};
+
+/* SWITCHDEV_OBJ_ID_PORT_VLAN */
+struct switchdev_obj_port_vlan {
+	struct switchdev_obj obj;
+	u16 flags;
+	u16 vid;
+	/* If set, the notifier signifies a change of one of the following
+	 * flags for a VLAN that already exists:
+	 * - BRIDGE_VLAN_INFO_PVID
+	 * - BRIDGE_VLAN_INFO_UNTAGGED
+	 * Entries with BRIDGE_VLAN_INFO_BRENTRY unset are not notified at all.
+	 */
+	bool changed;
+};
+
+#define SWITCHDEV_OBJ_PORT_VLAN(OBJ) \
+	container_of((OBJ), struct switchdev_obj_port_vlan, obj)
+
+/* SWITCHDEV_OBJ_ID_PORT_MDB */
+struct switchdev_obj_port_mdb {
+	struct switchdev_obj obj;
+	unsigned char addr[ETH_ALEN];
+	u16 vid;
+};
+
+#define SWITCHDEV_OBJ_PORT_MDB(OBJ) \
+	container_of((OBJ), struct switchdev_obj_port_mdb, obj)
+
+
+/* SWITCHDEV_OBJ_ID_MRP */
+struct switchdev_obj_mrp {
+	struct switchdev_obj obj;
+	struct net_device *p_port;
+	struct net_device *s_port;
+	u32 ring_id;
+	u16 prio;
+};
+
+#define SWITCHDEV_OBJ_MRP(OBJ) \
+	container_of((OBJ), struct switchdev_obj_mrp, obj)
+
+/* SWITCHDEV_OBJ_ID_RING_TEST_MRP */
+struct switchdev_obj_ring_test_mrp {
+	struct switchdev_obj obj;
+	/* The value is in us and a value of 0 represents to stop */
+	u32 interval;
+	u8 max_miss;
+	u32 ring_id;
+	u32 period;
+	bool monitor;
+};
+
+#define SWITCHDEV_OBJ_RING_TEST_MRP(OBJ) \
+	container_of((OBJ), struct switchdev_obj_ring_test_mrp, obj)
+
+/* SWICHDEV_OBJ_ID_RING_ROLE_MRP */
+struct switchdev_obj_ring_role_mrp {
+	struct switchdev_obj obj;
+	u8 ring_role;
+	u32 ring_id;
+	u8 sw_backup;
+};
+
+#define SWITCHDEV_OBJ_RING_ROLE_MRP(OBJ) \
+	container_of((OBJ), struct switchdev_obj_ring_role_mrp, obj)
+
+struct switchdev_obj_ring_state_mrp {
+	struct switchdev_obj obj;
+	u8 ring_state;
+	u32 ring_id;
+};
+
+#define SWITCHDEV_OBJ_RING_STATE_MRP(OBJ) \
+	container_of((OBJ), struct switchdev_obj_ring_state_mrp, obj)
+
+/* SWITCHDEV_OBJ_ID_IN_TEST_MRP */
+struct switchdev_obj_in_test_mrp {
+	struct switchdev_obj obj;
+	/* The value is in us and a value of 0 represents to stop */
+	u32 interval;
+	u32 in_id;
+	u32 period;
+	u8 max_miss;
+};
+
+#define SWITCHDEV_OBJ_IN_TEST_MRP(OBJ) \
+	container_of((OBJ), struct switchdev_obj_in_test_mrp, obj)
+
+/* SWICHDEV_OBJ_ID_IN_ROLE_MRP */
+struct switchdev_obj_in_role_mrp {
+	struct switchdev_obj obj;
+	struct net_device *i_port;
+	u32 ring_id;
+	u16 in_id;
+	u8 in_role;
+	u8 sw_backup;
+};
+
+#define SWITCHDEV_OBJ_IN_ROLE_MRP(OBJ) \
+	container_of((OBJ), struct switchdev_obj_in_role_mrp, obj)
+
+struct switchdev_obj_in_state_mrp {
+	struct switchdev_obj obj;
+	u32 in_id;
+	u8 in_state;
+};
+
+#define SWITCHDEV_OBJ_IN_STATE_MRP(OBJ) \
+	container_of((OBJ), struct switchdev_obj_in_state_mrp, obj)
+
+struct switchdev_brport {
+	struct net_device *dev;
+	const void *ctx;
+	struct notifier_block *atomic_nb;
+	struct notifier_block *blocking_nb;
+	bool tx_fwd_offload;
+};
+
+enum switchdev_notifier_type {
+	SWITCHDEV_FDB_ADD_TO_BRIDGE = 1,
+	SWITCHDEV_FDB_DEL_TO_BRIDGE,
+	SWITCHDEV_FDB_ADD_TO_DEVICE,
+	SWITCHDEV_FDB_DEL_TO_DEVICE,
+	SWITCHDEV_FDB_OFFLOADED,
+	SWITCHDEV_FDB_FLUSH_TO_BRIDGE,
+
+	SWITCHDEV_PORT_OBJ_ADD, /* Blocking. */
+	SWITCHDEV_PORT_OBJ_DEL, /* Blocking. */
+	SWITCHDEV_PORT_ATTR_SET, /* May be blocking . */
+
+	SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE,
+	SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE,
+	SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
+	SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE,
+	SWITCHDEV_VXLAN_FDB_OFFLOADED,
+
+	SWITCHDEV_BRPORT_OFFLOADED,
+	SWITCHDEV_BRPORT_UNOFFLOADED,
+	SWITCHDEV_BRPORT_REPLAY,
+};
+
+struct switchdev_notifier_info {
+	struct net_device *dev;
+	struct netlink_ext_ack *extack;
+	const void *ctx;
+};
+
+/* Remember to update br_switchdev_fdb_populate() when adding
+ * new members to this structure
+ */
+struct switchdev_notifier_fdb_info {
+	struct switchdev_notifier_info info; /* must be first */
+	const unsigned char *addr;
+	u16 vid;
+	u8 added_by_user:1,
+	   is_local:1,
+	   locked:1,
+	   offloaded:1;
+};
+
+struct switchdev_notifier_port_obj_info {
+	struct switchdev_notifier_info info; /* must be first */
+	const struct switchdev_obj *obj;
+	bool handled;
+};
+
+struct switchdev_notifier_port_attr_info {
+	struct switchdev_notifier_info info; /* must be first */
+	const struct switchdev_attr *attr;
+	bool handled;
+};
+
+struct switchdev_notifier_brport_info {
+	struct switchdev_notifier_info info; /* must be first */
+	const struct switchdev_brport brport;
+};
+
+static inline struct net_device *
+switchdev_notifier_info_to_dev(const struct switchdev_notifier_info *info)
+{
+	return info->dev;
+}
+
+static inline struct netlink_ext_ack *
+switchdev_notifier_info_to_extack(const struct switchdev_notifier_info *info)
+{
+	return info->extack;
+}
+
+static inline bool
+switchdev_fdb_is_dynamically_learned(const struct switchdev_notifier_fdb_info *fdb_info)
+{
+	return !fdb_info->added_by_user && !fdb_info->is_local;
+}
+
+#ifdef CONFIG_NET_SWITCHDEV
+
+int switchdev_bridge_port_offload(struct net_device *brport_dev,
+				  struct net_device *dev, const void *ctx,
+				  struct notifier_block *atomic_nb,
+				  struct notifier_block *blocking_nb,
+				  bool tx_fwd_offload,
+				  struct netlink_ext_ack *extack);
+void switchdev_bridge_port_unoffload(struct net_device *brport_dev,
+				     const void *ctx,
+				     struct notifier_block *atomic_nb,
+				     struct notifier_block *blocking_nb);
+int switchdev_bridge_port_replay(struct net_device *brport_dev,
+				 struct net_device *dev, const void *ctx,
+				 struct notifier_block *atomic_nb,
+				 struct notifier_block *blocking_nb,
+				 struct netlink_ext_ack *extack);
+
+void switchdev_deferred_process(void);
+int switchdev_port_attr_set(struct net_device *dev,
+			    const struct switchdev_attr *attr,
+			    struct netlink_ext_ack *extack);
+bool switchdev_port_obj_act_is_deferred(struct net_device *dev,
+					enum switchdev_notifier_type nt,
+					const struct switchdev_obj *obj);
+int switchdev_port_obj_add(struct net_device *dev,
+			   const struct switchdev_obj *obj,
+			   struct netlink_ext_ack *extack);
+int switchdev_port_obj_del(struct net_device *dev,
+			   const struct switchdev_obj *obj);
+
+int register_switchdev_notifier(struct notifier_block *nb);
+int unregister_switchdev_notifier(struct notifier_block *nb);
+int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
+			     struct switchdev_notifier_info *info,
+			     struct netlink_ext_ack *extack);
+
+int register_switchdev_blocking_notifier(struct notifier_block *nb);
+int unregister_switchdev_blocking_notifier(struct notifier_block *nb);
+int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev,
+				      struct switchdev_notifier_info *info,
+				      struct netlink_ext_ack *extack);
+
+int switchdev_handle_fdb_event_to_device(struct net_device *dev, unsigned long event,
+		const struct switchdev_notifier_fdb_info *fdb_info,
+		bool (*check_cb)(const struct net_device *dev),
+		bool (*foreign_dev_check_cb)(const struct net_device *dev,
+					     const struct net_device *foreign_dev),
+		int (*mod_cb)(struct net_device *dev, struct net_device *orig_dev,
+			      unsigned long event, const void *ctx,
+			      const struct switchdev_notifier_fdb_info *fdb_info));
+
+int switchdev_handle_port_obj_add(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*add_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_obj *obj,
+				      struct netlink_ext_ack *extack));
+int switchdev_handle_port_obj_add_foreign(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			bool (*foreign_dev_check_cb)(const struct net_device *dev,
+						     const struct net_device *foreign_dev),
+			int (*add_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_obj *obj,
+				      struct netlink_ext_ack *extack));
+int switchdev_handle_port_obj_del(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*del_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_obj *obj));
+int switchdev_handle_port_obj_del_foreign(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			bool (*foreign_dev_check_cb)(const struct net_device *dev,
+						     const struct net_device *foreign_dev),
+			int (*del_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_obj *obj));
+
+int switchdev_handle_port_attr_set(struct net_device *dev,
+			struct switchdev_notifier_port_attr_info *port_attr_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*set_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_attr *attr,
+				      struct netlink_ext_ack *extack));
+#else
+
+static inline int
+switchdev_bridge_port_offload(struct net_device *brport_dev,
+			      struct net_device *dev, const void *ctx,
+			      struct notifier_block *atomic_nb,
+			      struct notifier_block *blocking_nb,
+			      bool tx_fwd_offload,
+			      struct netlink_ext_ack *extack)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void
+switchdev_bridge_port_unoffload(struct net_device *brport_dev,
+				const void *ctx,
+				struct notifier_block *atomic_nb,
+				struct notifier_block *blocking_nb)
+{
+}
+
+static inline void switchdev_deferred_process(void)
+{
+}
+
+static inline int switchdev_port_attr_set(struct net_device *dev,
+					  const struct switchdev_attr *attr,
+					  struct netlink_ext_ack *extack)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int switchdev_port_obj_add(struct net_device *dev,
+					 const struct switchdev_obj *obj,
+					 struct netlink_ext_ack *extack)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int switchdev_port_obj_del(struct net_device *dev,
+					 const struct switchdev_obj *obj)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int register_switchdev_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+
+static inline int unregister_switchdev_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+
+static inline int call_switchdev_notifiers(unsigned long val,
+					   struct net_device *dev,
+					   struct switchdev_notifier_info *info,
+					   struct netlink_ext_ack *extack)
+{
+	return NOTIFY_DONE;
+}
+
+static inline int
+register_switchdev_blocking_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+
+static inline int
+unregister_switchdev_blocking_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+
+static inline int
+call_switchdev_blocking_notifiers(unsigned long val,
+				  struct net_device *dev,
+				  struct switchdev_notifier_info *info,
+				  struct netlink_ext_ack *extack)
+{
+	return NOTIFY_DONE;
+}
+
+static inline int
+switchdev_handle_fdb_event_to_device(struct net_device *dev, unsigned long event,
+		const struct switchdev_notifier_fdb_info *fdb_info,
+		bool (*check_cb)(const struct net_device *dev),
+		bool (*foreign_dev_check_cb)(const struct net_device *dev,
+					     const struct net_device *foreign_dev),
+		int (*mod_cb)(struct net_device *dev, struct net_device *orig_dev,
+			      unsigned long event, const void *ctx,
+			      const struct switchdev_notifier_fdb_info *fdb_info))
+{
+	return 0;
+}
+
+static inline int
+switchdev_handle_port_obj_add(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*add_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_obj *obj,
+				      struct netlink_ext_ack *extack))
+{
+	return 0;
+}
+
+static inline int switchdev_handle_port_obj_add_foreign(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			bool (*foreign_dev_check_cb)(const struct net_device *dev,
+						     const struct net_device *foreign_dev),
+			int (*add_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_obj *obj,
+				      struct netlink_ext_ack *extack))
+{
+	return 0;
+}
+
+static inline int
+switchdev_handle_port_obj_del(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*del_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_obj *obj))
+{
+	return 0;
+}
+
+static inline int
+switchdev_handle_port_obj_del_foreign(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			bool (*foreign_dev_check_cb)(const struct net_device *dev,
+						     const struct net_device *foreign_dev),
+			int (*del_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_obj *obj))
+{
+	return 0;
+}
+
+static inline int
+switchdev_handle_port_attr_set(struct net_device *dev,
+			struct switchdev_notifier_port_attr_info *port_attr_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*set_cb)(struct net_device *dev, const void *ctx,
+				      const struct switchdev_attr *attr,
+				      struct netlink_ext_ack *extack))
+{
+	return 0;
+}
+#endif
+
+#endif /* _LINUX_SWITCHDEV_H_ */