/* * ring buffer based function tracer * * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> * * Based on code from the latency_tracer, that is: * *  Copyright (C) 2004-2006 Ingo Molnar *  Copyright (C) 2004 William Lee Irwin III */#include <linux/debugfs.h>#include <linux/uaccess.h>#include <linux/ftrace.h>#include <linux/fs.h> #include "trace.h" static void start_function_trace(struct trace_array *tr){	tr->cpu = get_cpu();	tracing_reset_online_cpus(tr);	put_cpu(); 	tracing_start_cmdline_record();	tracing_start_function_trace();} static void stop_function_trace(struct trace_array *tr){	tracing_stop_function_trace();	tracing_stop_cmdline_record();} static int function_trace_init(struct trace_array *tr){	start_function_trace(tr);	return 0;} static void function_trace_reset(struct trace_array *tr){	stop_function_trace(tr);} static void function_trace_start(struct trace_array *tr){	tracing_reset_online_cpus(tr);} static struct tracer function_trace __read_mostly ={	.name	     = "function",	.init	     = function_trace_init,	.reset	     = function_trace_reset,	.start	     = function_trace_start,#ifdef CONFIG_FTRACE_SELFTEST	.selftest    = trace_selftest_startup_function,#endif}; static __init int init_function_trace(void){	return register_tracer(&function_trace);} device_initcall(init_function_trace);