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Commit 8179e8a1 authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Steven Rostedt
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tracing: Do not create function tracer options when not compiled in 



When the function tracer is not compiled in, do not create the option files
for it.

Fix up both the sched_wakeup and irqsoff tracers to handle the change.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 4ee4301c

kernel/trace/trace.c

+2 −2
Original line number Diff line number Diff line
@@ -490,11 +490,11 @@ static inline void ftrace_trace_stack(struct ring_buffer *buffer, 


/* trace_flags holds trace_options default values */

unsigned long trace_flags =

	FUNCTION_GRAPH_DEFAULT_FLAGS |

	FUNCTION_DEFAULT_FLAGS | FUNCTION_GRAPH_DEFAULT_FLAGS |

	TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |

	TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO |

	TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |

	TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS | TRACE_ITER_FUNCTION

	TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS

	;



static void tracer_tracing_on(struct trace_array *tr)

kernel/trace/trace.h

+10 −1
Original line number Diff line number Diff line
@@ -902,6 +902,15 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 
# define BRANCH_FLAGS

#endif



#ifdef CONFIG_FUNCTION_TRACER

# define FUNCTION_FLAGS						\

		C(FUNCTION,		"function-trace"),

# define FUNCTION_DEFAULT_FLAGS		TRACE_ITER_FUNCTION

#else

# define FUNCTION_FLAGS

# define FUNCTION_DEFAULT_FLAGS		0UL

#endif



/*

 * trace_iterator_flags is an enumeration that defines bit

 * positions into trace_flags that controls the output.
@@ -931,7 +940,7 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 
		C(STOP_ON_FREE,		"disable_on_free"),	\

		C(IRQ_INFO,		"irq-info"),		\

		C(MARKERS,		"markers"),		\

		C(FUNCTION,		"function-trace"),	\

		FUNCTION_FLAGS					\

		FGRAPH_FLAGS					\

		BRANCH_FLAGS

kernel/trace/trace_irqsoff.c

+23 −5
Original line number Diff line number Diff line
@@ -31,7 +31,6 @@ enum { 
static int trace_type __read_mostly;



static int save_flags;

static bool function_enabled;



static void stop_irqsoff_tracer(struct trace_array *tr, int graph);

static int start_irqsoff_tracer(struct trace_array *tr, int graph);
@@ -249,21 +248,23 @@ __trace_function(struct trace_array *tr, 
#else

#define __trace_function trace_function



#ifdef CONFIG_FUNCTION_TRACER

static int irqsoff_graph_entry(struct ftrace_graph_ent *trace)

{

	return -1;

}

#endif



static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)

{

	return TRACE_TYPE_UNHANDLED;

}



static void irqsoff_graph_return(struct ftrace_graph_ret *trace) { }

static void irqsoff_trace_open(struct trace_iterator *iter) { }

static void irqsoff_trace_close(struct trace_iterator *iter) { }



#ifdef CONFIG_FUNCTION_TRACER

static void irqsoff_graph_return(struct ftrace_graph_ret *trace) { }

static void irqsoff_print_header(struct seq_file *s)

{

	trace_default_header(s);
@@ -507,6 +508,9 @@ void trace_preempt_off(unsigned long a0, unsigned long a1) 
}

#endif /* CONFIG_PREEMPT_TRACER */



#ifdef CONFIG_FUNCTION_TRACER

static bool function_enabled;



static int register_irqsoff_function(struct trace_array *tr, int graph, int set)

{

	int ret;
@@ -540,21 +544,35 @@ static void unregister_irqsoff_function(struct trace_array *tr, int graph) 
	function_enabled = false;

}



static int irqsoff_function_set(struct trace_array *tr, int set)

static int irqsoff_function_set(struct trace_array *tr, u32 mask, int set)

{

	if (!(mask & TRACE_ITER_FUNCTION))

		return 0;



	if (set)

		register_irqsoff_function(tr, is_graph(), 1);

	else

		unregister_irqsoff_function(tr, is_graph());

	return 1;

}

#else

static int register_irqsoff_function(struct trace_array *tr, int graph, int set)

{

	return 0;

}

static void unregister_irqsoff_function(struct trace_array *tr, int graph) { }

static inline int irqsoff_function_set(struct trace_array *tr, u32 mask, int set)

{

	return 0;

}

#endif /* CONFIG_FUNCTION_TRACER */



static int irqsoff_flag_changed(struct trace_array *tr, u32 mask, int set)

{

	struct tracer *tracer = tr->current_trace;



	if (mask & TRACE_ITER_FUNCTION)

		return irqsoff_function_set(tr, set);

	if (irqsoff_function_set(tr, mask, set))

		return 0;



#ifdef CONFIG_FUNCTION_GRAPH_TRACER

	if (mask & TRACE_ITER_DISPLAY_GRAPH)

kernel/trace/trace_sched_wakeup.c

+28 −14
Original line number Diff line number Diff line
@@ -34,11 +34,8 @@ static arch_spinlock_t wakeup_lock = 


static void wakeup_reset(struct trace_array *tr);

static void __wakeup_reset(struct trace_array *tr);

static int wakeup_graph_entry(struct ftrace_graph_ent *trace);

static void wakeup_graph_return(struct ftrace_graph_ret *trace);



static int save_flags;

static bool function_enabled;



#ifdef CONFIG_FUNCTION_GRAPH_TRACER

static int wakeup_display_graph(struct trace_array *tr, int set);
@@ -46,7 +43,7 @@ static int wakeup_display_graph(struct trace_array *tr, int set); 
#else

static inline int wakeup_display_graph(struct trace_array *tr, int set)

{

	return -EINVAL;

	return 0;

}

# define is_graph() false

#endif
@@ -54,6 +51,11 @@ static inline int wakeup_display_graph(struct trace_array *tr, int set) 


#ifdef CONFIG_FUNCTION_TRACER



static int wakeup_graph_entry(struct ftrace_graph_ent *trace);

static void wakeup_graph_return(struct ftrace_graph_ret *trace);



static bool function_enabled;



/*

 * Prologue for the wakeup function tracers.

 *
@@ -123,7 +125,6 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip, 
	atomic_dec(&data->disabled);

	preempt_enable_notrace();

}

#endif /* CONFIG_FUNCTION_TRACER */



static int register_wakeup_function(struct trace_array *tr, int graph, int set)

{
@@ -158,21 +159,35 @@ static void unregister_wakeup_function(struct trace_array *tr, int graph) 
	function_enabled = false;

}



static int wakeup_function_set(struct trace_array *tr, int set)

static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)

{

	if (!(mask & TRACE_ITER_FUNCTION))

		return 0;



	if (set)

		register_wakeup_function(tr, is_graph(), 1);

	else

		unregister_wakeup_function(tr, is_graph());

	return 1;

}

#else

static int register_wakeup_function(struct trace_array *tr, int graph, int set)

{

	return 0;

}

static void unregister_wakeup_function(struct trace_array *tr, int graph) { }

static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)

{

	return 0;

}

#endif /* CONFIG_FUNCTION_TRACER */



static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set)

{

	struct tracer *tracer = tr->current_trace;



	if (mask & TRACE_ITER_FUNCTION)

		return wakeup_function_set(tr, set);

	if (wakeup_function_set(tr, mask, set))

		return 0;



#ifdef CONFIG_FUNCTION_GRAPH_TRACER

	if (mask & TRACE_ITER_DISPLAY_GRAPH)
@@ -302,21 +317,20 @@ __trace_function(struct trace_array *tr, 
#else

#define __trace_function trace_function



static int wakeup_graph_entry(struct ftrace_graph_ent *trace)

{

	return -1;

}



static enum print_line_t wakeup_print_line(struct trace_iterator *iter)

{

	return TRACE_TYPE_UNHANDLED;

}



static void wakeup_graph_return(struct ftrace_graph_ret *trace) { }

static void wakeup_trace_open(struct trace_iterator *iter) { }

static void wakeup_trace_close(struct trace_iterator *iter) { }



#ifdef CONFIG_FUNCTION_TRACER

static int wakeup_graph_entry(struct ftrace_graph_ent *trace)

{

	return -1;

}

static void wakeup_graph_return(struct ftrace_graph_ret *trace) { }

static void wakeup_print_header(struct seq_file *s)

{

	trace_default_header(s);