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Commit b02ee9a3 authored by Minho Ban's avatar Minho Ban Committed by Steven Rostedt
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tracing: Prevent wasting time evaluating parameters in trace_preempt_on/off 

This fixes spending time for evaluating parameters in trace_preempt_on/off when
the tracer config is off.

The patch mainly inspired by Steven Rostedt, thanks Steven.

Link: http://lkml.kernel.org/r/4FA73510.7070705@samsung.com



Cc: Ingo Molnar <mingo@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Turner <pjt@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: default avatarMinho Ban <mhban@samsung.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 19631cb3

include/linux/ftrace.h

+6 −2
Original line number Original line Diff line number Diff line
@@ -491,8 +491,12 @@ static inline void __ftrace_enabled_restore(int enabled) 
  extern void trace_preempt_on(unsigned long a0, unsigned long a1);

  extern void trace_preempt_on(unsigned long a0, unsigned long a1);

  extern void trace_preempt_off(unsigned long a0, unsigned long a1);

  extern void trace_preempt_off(unsigned long a0, unsigned long a1);

#else

#else

  static inline void trace_preempt_on(unsigned long a0, unsigned long a1) { }

/*

  static inline void trace_preempt_off(unsigned long a0, unsigned long a1) { }

 * Use defines instead of static inlines because some arches will make code out

 * of the CALLER_ADDR, when we really want these to be a real nop.

 */

# define trace_preempt_on(a0, a1) do { } while (0)

# define trace_preempt_off(a0, a1) do { } while (0)

#endif

#endif





#ifdef CONFIG_FTRACE_MCOUNT_RECORD

#ifdef CONFIG_FTRACE_MCOUNT_RECORD