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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/kernel/trace/trace_functions.c
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@@ -34,29 +34,37 @@
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 	TRACE_FUNC_OPT_STACK	= 0x1,
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 };
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-static int allocate_ftrace_ops(struct trace_array *tr)
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+int ftrace_allocate_ftrace_ops(struct trace_array *tr)
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 {
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 	struct ftrace_ops *ops;
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+
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+	/* The top level array uses the "global_ops" */
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+	if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
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+		return 0;
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 	ops = kzalloc(sizeof(*ops), GFP_KERNEL);
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 	if (!ops)
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 		return -ENOMEM;
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-	/* Currently only the non stack verision is supported */
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+	/* Currently only the non stack version is supported */
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 	ops->func = function_trace_call;
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 	ops->flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_PID;
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 	tr->ops = ops;
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 	ops->private = tr;
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+
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 	return 0;
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 }
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+void ftrace_free_ftrace_ops(struct trace_array *tr)
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+{
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+	kfree(tr->ops);
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+	tr->ops = NULL;
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+}
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 int ftrace_create_function_files(struct trace_array *tr,
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 				 struct dentry *parent)
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 {
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-	int ret;
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-
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 	/*
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 	 * The top level array uses the "global_ops", and the files are
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 	 * created on boot up.
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@@ -64,9 +72,8 @@
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 	if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
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 		return 0;
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-	ret = allocate_ftrace_ops(tr);
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-	if (ret)
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-		return ret;
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+	if (!tr->ops)
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+		return -EINVAL;
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 	ftrace_create_filter_files(tr->ops, parent);
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@@ -76,8 +83,7 @@
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 void ftrace_destroy_function_files(struct trace_array *tr)
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 {
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 	ftrace_destroy_filter_files(tr->ops);
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-	kfree(tr->ops);
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-	tr->ops = NULL;
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+	ftrace_free_ftrace_ops(tr);
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 }
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 static int function_trace_init(struct trace_array *tr)
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@@ -101,7 +107,7 @@
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 	ftrace_init_array_ops(tr, func);
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-	tr->trace_buffer.cpu = get_cpu();
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+	tr->array_buffer.cpu = get_cpu();
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 	put_cpu();
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 	tracing_start_cmdline_record();
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@@ -118,7 +124,7 @@
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124
 
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 static void function_trace_start(struct trace_array *tr)
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 {
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-	tracing_reset_online_cpus(&tr->trace_buffer);
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+	tracing_reset_online_cpus(&tr->array_buffer);
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 }
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 static void
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@@ -127,15 +133,14 @@
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 {
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 	struct trace_array *tr = op->private;
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 	struct trace_array_cpu *data;
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-	unsigned long flags;
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+	unsigned int trace_ctx;
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 	int bit;
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 	int cpu;
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-	int pc;
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 	if (unlikely(!tr->function_enabled))
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 		return;
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-	pc = preempt_count();
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+	trace_ctx = tracing_gen_ctx();
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 	preempt_disable_notrace();
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 	bit = trace_test_and_set_recursion(TRACE_FTRACE_START);
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@@ -143,11 +148,10 @@
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 		goto out;
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 	cpu = smp_processor_id();
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-	data = per_cpu_ptr(tr->trace_buffer.data, cpu);
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-	if (!atomic_read(&data->disabled)) {
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-		local_save_flags(flags);
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-		trace_function(tr, ip, parent_ip, flags, pc);
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-	}
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+	data = per_cpu_ptr(tr->array_buffer.data, cpu);
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+	if (!atomic_read(&data->disabled))
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+		trace_function(tr, ip, parent_ip, trace_ctx);
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+
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 	trace_clear_recursion(bit);
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  out:
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@@ -181,7 +185,7 @@
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 	unsigned long flags;
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 	long disabled;
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 	int cpu;
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-	int pc;
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+	unsigned int trace_ctx;
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 	if (unlikely(!tr->function_enabled))
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 		return;
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@@ -192,13 +196,13 @@
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 	 */
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 	local_irq_save(flags);
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 	cpu = raw_smp_processor_id();
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-	data = per_cpu_ptr(tr->trace_buffer.data, cpu);
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+	data = per_cpu_ptr(tr->array_buffer.data, cpu);
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 	disabled = atomic_inc_return(&data->disabled);
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 	if (likely(disabled == 1)) {
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-		pc = preempt_count();
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-		trace_function(tr, ip, parent_ip, flags, pc);
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-		__trace_stack(tr, flags, STACK_SKIP, pc);
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+		trace_ctx = tracing_gen_ctx_flags(flags);
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+		trace_function(tr, ip, parent_ip, trace_ctx);
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+		__trace_stack(tr, trace_ctx, STACK_SKIP);
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 	}
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 	atomic_dec(&data->disabled);
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@@ -401,13 +405,11 @@
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405
 
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 static __always_inline void trace_stack(struct trace_array *tr)
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 {
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-	unsigned long flags;
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-	int pc;
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+	unsigned int trace_ctx;
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409
 
407
-	local_save_flags(flags);
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-	pc = preempt_count();
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+	trace_ctx = tracing_gen_ctx();
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410
-	__trace_stack(tr, flags, FTRACE_STACK_SKIP, pc);
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+	__trace_stack(tr, trace_ctx, FTRACE_STACK_SKIP);
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 }
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 static void