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, 292 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/acdebug.h b/drivers/acpi/acpica/acdebug.h
new file mode 100644
index 000000000..09ab8b3db
--- /dev/null
+++ b/drivers/acpi/acpica/acdebug.h
@@ -0,0 +1,292 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
+/******************************************************************************
+ *
+ * Name: acdebug.h - ACPI/AML debugger
+ *
+ * Copyright (C) 2000 - 2026, Intel Corp.
+ *
+ *****************************************************************************/
+
+#ifndef __ACDEBUG_H__
+#define __ACDEBUG_H__
+
+/* The debugger is used in conjunction with the disassembler most of time */
+
+#ifdef ACPI_DISASSEMBLER
+#include "acdisasm.h"
+#endif
+
+#define ACPI_DEBUG_BUFFER_SIZE      0x4000	/* 16K buffer for return objects */
+#define ACPI_DEBUG_LENGTH_FORMAT    " (%.4X bits, %.3X bytes)"
+
+struct acpi_db_command_info {
+	const char *name;	/* Command Name */
+	u8 min_args;		/* Minimum arguments required */
+};
+
+struct acpi_db_command_help {
+	u8 line_count;		/* Number of help lines */
+	char *invocation;	/* Command Invocation */
+	char *description;	/* Command Description */
+};
+
+struct acpi_db_argument_info {
+	const char *name;	/* Argument Name */
+};
+
+struct acpi_db_execute_walk {
+	u32 count;
+	u32 max_count;
+	char name_seg[ACPI_NAMESEG_SIZE + 1];
+};
+
+#define PARAM_LIST(pl)                  pl
+
+#define EX_NO_SINGLE_STEP               1
+#define EX_SINGLE_STEP                  2
+#define EX_ALL                          4
+
+/*
+ * dbxface - external debugger interfaces
+ */
+ACPI_DBR_DEPENDENT_RETURN_OK(acpi_status
+			     acpi_db_single_step(struct acpi_walk_state
+						 *walk_state,
+						 union acpi_parse_object *op,
+						 u32 op_type))
+ ACPI_DBR_DEPENDENT_RETURN_VOID(void
+				acpi_db_signal_break_point(struct
+							   acpi_walk_state
+							   *walk_state))
+
+/*
+ * dbcmds - debug commands and output routines
+ */
+struct acpi_namespace_node *acpi_db_convert_to_node(char *in_string);
+
+void acpi_db_display_table_info(char *table_arg);
+
+void acpi_db_display_template(char *buffer_arg);
+
+void acpi_db_unload_acpi_table(char *name);
+
+void acpi_db_send_notify(char *name, u32 value);
+
+void acpi_db_display_interfaces(char *action_arg, char *interface_name_arg);
+
+acpi_status acpi_db_sleep(char *object_arg);
+
+void acpi_db_trace(char *enable_arg, char *method_arg, char *once_arg);
+
+void acpi_db_display_locks(void);
+
+void acpi_db_display_resources(char *object_arg);
+
+ACPI_HW_DEPENDENT_RETURN_VOID(void acpi_db_display_gpes(void))
+
+void acpi_db_display_handlers(void);
+
+ACPI_HW_DEPENDENT_RETURN_VOID(void
+			      acpi_db_generate_gpe(char *gpe_arg,
+						   char *block_arg))
+ACPI_HW_DEPENDENT_RETURN_VOID(void acpi_db_generate_sci(void))
+
+void acpi_db_execute_test(char *type_arg);
+
+/*
+ * dbconvert - miscellaneous conversion routines
+ */
+acpi_status acpi_db_hex_char_to_value(int hex_char, u8 *return_value);
+
+acpi_status acpi_db_convert_to_package(char *string, union acpi_object *object);
+
+acpi_status
+acpi_db_convert_to_object(acpi_object_type type,
+			  char *string, union acpi_object *object);
+
+u8 *acpi_db_encode_pld_buffer(struct acpi_pld_info *pld_info);
+
+void acpi_db_dump_pld_buffer(union acpi_object *obj_desc);
+
+/*
+ * dbmethod - control method commands
+ */
+void
+acpi_db_set_method_breakpoint(char *location,
+			      struct acpi_walk_state *walk_state,
+			      union acpi_parse_object *op);
+
+void acpi_db_set_method_call_breakpoint(union acpi_parse_object *op);
+
+void acpi_db_set_method_data(char *type_arg, char *index_arg, char *value_arg);
+
+acpi_status acpi_db_disassemble_method(char *name);
+
+void acpi_db_disassemble_aml(char *statements, union acpi_parse_object *op);
+
+void acpi_db_evaluate_predefined_names(void);
+
+void acpi_db_evaluate_all(char *name_seg);
+
+/*
+ * dbnames - namespace commands
+ */
+void acpi_db_set_scope(char *name);
+
+void acpi_db_dump_namespace(char *start_arg, char *depth_arg);
+
+void acpi_db_dump_namespace_paths(void);
+
+void acpi_db_dump_namespace_by_owner(char *owner_arg, char *depth_arg);
+
+acpi_status acpi_db_find_name_in_namespace(char *name_arg);
+
+void acpi_db_check_predefined_names(void);
+
+acpi_status
+acpi_db_display_objects(char *obj_type_arg, char *display_count_arg);
+
+void acpi_db_check_integrity(void);
+
+void acpi_db_find_references(char *object_arg);
+
+void acpi_db_get_bus_info(void);
+
+acpi_status acpi_db_display_fields(u32 address_space_id);
+
+/*
+ * dbdisply - debug display commands
+ */
+void acpi_db_display_method_info(union acpi_parse_object *op);
+
+void acpi_db_decode_and_display_object(char *target, char *output_type);
+
+ACPI_DBR_DEPENDENT_RETURN_VOID(void
+			       acpi_db_display_result_object(union
+							     acpi_operand_object
+							     *obj_desc,
+							     struct
+							     acpi_walk_state
+							     *walk_state))
+
+acpi_status acpi_db_display_all_methods(char *display_count_arg);
+
+void acpi_db_display_arguments(void);
+
+void acpi_db_display_locals(void);
+
+void acpi_db_display_results(void);
+
+void acpi_db_display_calling_tree(void);
+
+void acpi_db_display_object_type(char *object_arg);
+
+ACPI_DBR_DEPENDENT_RETURN_VOID(void
+			       acpi_db_display_argument_object(union
+							       acpi_operand_object
+							       *obj_desc,
+							       struct
+							       acpi_walk_state
+							       *walk_state))
+
+/*
+ * dbexec - debugger control method execution
+ */
+void
+acpi_db_execute(char *name, char **args, acpi_object_type *types, u32 flags);
+
+void
+acpi_db_create_execution_thread(char *method_name_arg,
+				char **arguments, acpi_object_type *types);
+
+void
+acpi_db_create_execution_threads(char *num_threads_arg,
+				 char *num_loops_arg, char *method_name_arg);
+
+void acpi_db_delete_objects(u32 count, union acpi_object *objects);
+
+#ifdef ACPI_DBG_TRACK_ALLOCATIONS
+u32 acpi_db_get_cache_info(struct acpi_memory_list *cache);
+#endif
+
+/*
+ * dbfileio - Debugger file I/O commands
+ */
+acpi_object_type
+acpi_db_match_argument(char *user_argument,
+		       struct acpi_db_argument_info *arguments);
+
+void acpi_db_close_debug_file(void);
+
+void acpi_db_open_debug_file(char *name);
+
+acpi_status acpi_db_load_acpi_table(char *filename);
+
+acpi_status acpi_db_load_tables(struct acpi_new_table_desc *list_head);
+
+/*
+ * dbhistry - debugger HISTORY command
+ */
+void acpi_db_add_to_history(char *command_line);
+
+void acpi_db_display_history(void);
+
+char *acpi_db_get_from_history(char *command_num_arg);
+
+char *acpi_db_get_history_by_index(u32 commandd_num);
+
+/*
+ * dbinput - user front-end to the AML debugger
+ */
+acpi_status
+acpi_db_command_dispatch(char *input_buffer,
+			 struct acpi_walk_state *walk_state,
+			 union acpi_parse_object *op);
+
+void ACPI_SYSTEM_XFACE acpi_db_execute_thread(void *context);
+
+acpi_status acpi_db_user_commands(void);
+
+char *acpi_db_get_next_token(char *string,
+			     char **next, acpi_object_type *return_type);
+
+/*
+ * dbobject
+ */
+void acpi_db_decode_internal_object(union acpi_operand_object *obj_desc);
+
+void
+acpi_db_display_internal_object(union acpi_operand_object *obj_desc,
+				struct acpi_walk_state *walk_state);
+
+void acpi_db_decode_arguments(struct acpi_walk_state *walk_state);
+
+void acpi_db_decode_locals(struct acpi_walk_state *walk_state);
+
+void
+acpi_db_dump_method_info(acpi_status status,
+			 struct acpi_walk_state *walk_state);
+
+/*
+ * dbstats - Generation and display of ACPI table statistics
+ */
+void acpi_db_generate_statistics(union acpi_parse_object *root, u8 is_method);
+
+acpi_status acpi_db_display_statistics(char *type_arg);
+
+/*
+ * dbutils - AML debugger utilities
+ */
+void acpi_db_set_output_destination(u32 where);
+
+void acpi_db_dump_external_object(union acpi_object *obj_desc, u32 level);
+
+void acpi_db_prep_namestring(char *name);
+
+struct acpi_namespace_node *acpi_db_local_ns_lookup(char *name);
+
+void acpi_db_uint32_to_hex_string(u32 value, char *buffer);
+
+void acpi_db_generate_interrupt(char *gsiv_arg);
+
+#endif				/* __ACDEBUG_H__ */