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Commit 001b6767 authored by Steven Rostedt's avatar Steven Rostedt Committed by Ingo Molnar
Browse files

ftrace: define function trace nop 



When CONFIG_FTRACE is not enabled, the tracing_start_functon_trace
and tracing_stop_function_trace should be nops.

Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 007c05d4

kernel/trace/trace.h

+8 −2
Original line number Diff line number Diff line
@@ -216,8 +216,6 @@ void trace_function(struct trace_array *tr, 
		    unsigned long parent_ip,

		    unsigned long flags);



void tracing_start_function_trace(void);

void tracing_stop_function_trace(void);

void tracing_start_cmdline_record(void);

void tracing_stop_cmdline_record(void);

int register_tracer(struct tracer *type);
@@ -234,6 +232,14 @@ void update_max_tr_single(struct trace_array *tr, 


extern cycle_t ftrace_now(int cpu);



#ifdef CONFIG_FTRACE

void tracing_start_function_trace(void);

void tracing_stop_function_trace(void);

#else

# define tracing_start_function_trace()		do { } while (0)

# define tracing_stop_function_trace()		do { } while (0)

#endif



#ifdef CONFIG_CONTEXT_SWITCH_TRACER

typedef void

(*tracer_switch_func_t)(void *private,