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tracing: Only create function graph options when it is compiled in

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Do not create fuction graph tracer options when function graph tracer is not
even compiled in.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-09-29 10:15:10 -04:00 committed by Steven Rostedt
parent a3418a364e
commit 729358da95
4 changed files with 32 additions and 11 deletions
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11
kernel/trace/trace.c
View File

@ -489,10 +489,13 @@ static inline void ftrace_trace_stack(struct ring_buffer *buffer,
#endif
/* trace_flags holds trace_options default values */
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |
TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS | TRACE_ITER_FUNCTION;
unsigned long trace_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
;
static void tracer_tracing_on(struct trace_array *tr)
{

20
kernel/trace/trace.h
View File

@ -879,6 +879,22 @@ extern void trace_parser_put(struct trace_parser *parser);
extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
size_t cnt, loff_t *ppos);
/*
* Only create function graph options if function graph is configured.
*/
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
# define FGRAPH_FLAGS \
C(SLEEP_TIME, "sleep-time"), \
C(GRAPH_TIME, "graph-time"), \
C(DISPLAY_GRAPH, "display-graph"),
/* Initially set for trace_flags */
# define FUNCTION_GRAPH_DEFAULT_FLAGS \
(TRACE_ITER_SLEEP_TIME | TRACE_ITER_GRAPH_TIME)
#else
# define FGRAPH_FLAGS
# define FUNCTION_GRAPH_DEFAULT_FLAGS 0UL
#endif
/*
* trace_iterator_flags is an enumeration that defines bit
* positions into trace_flags that controls the output.
@ -904,15 +920,13 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
C(PRINTK_MSGONLY, "printk-msg-only"), \
C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
C(LATENCY_FMT, "latency-format"), \
C(SLEEP_TIME, "sleep-time"), \
C(GRAPH_TIME, "graph-time"), \
C(RECORD_CMD, "record-cmd"), \
C(OVERWRITE, "overwrite"), \
C(STOP_ON_FREE, "disable_on_free"), \
C(IRQ_INFO, "irq-info"), \
C(MARKERS, "markers"), \
C(FUNCTION, "function-trace"), \
C(DISPLAY_GRAPH, "display-graph"),
FGRAPH_FLAGS
/*
* By defining C, we can make TRACE_FLAGS a list of bit names

6
kernel/trace/trace_irqsoff.c
View File

@ -57,15 +57,15 @@ irq_trace(void)
# define irq_trace() (0)
#endif
#define is_graph() (trace_flags & TRACE_ITER_DISPLAY_GRAPH)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static int irqsoff_display_graph(struct trace_array *tr, int set);
# define is_graph() (trace_flags & TRACE_ITER_DISPLAY_GRAPH)
#else
static inline int irqsoff_display_graph(struct trace_array *tr, int set)
{
return -EINVAL;
}
# define is_graph() false
#endif
/*
@ -556,8 +556,10 @@ static int irqsoff_flag_changed(struct trace_array *tr, u32 mask, int set)
if (mask & TRACE_ITER_FUNCTION)
return irqsoff_function_set(tr, set);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if (mask & TRACE_ITER_DISPLAY_GRAPH)
return irqsoff_display_graph(tr, set);
#endif
return trace_keep_overwrite(tracer, mask, set);
}

6
kernel/trace/trace_sched_wakeup.c
View File

@ -40,15 +40,15 @@ static void wakeup_graph_return(struct ftrace_graph_ret *trace);
static int save_flags;
static bool function_enabled;
#define is_graph() (trace_flags & TRACE_ITER_DISPLAY_GRAPH)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static int wakeup_display_graph(struct trace_array *tr, int set);
# define is_graph() (trace_flags & TRACE_ITER_DISPLAY_GRAPH)
#else
static inline int wakeup_display_graph(struct trace_array *tr, int set)
{
return -EINVAL;
}
# define is_graph() false
#endif
@ -174,8 +174,10 @@ static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set)
if (mask & TRACE_ITER_FUNCTION)
return wakeup_function_set(tr, set);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if (mask & TRACE_ITER_DISPLAY_GRAPH)
return wakeup_display_graph(tr, set);
#endif
return trace_keep_overwrite(tracer, mask, set);
}