linux-kernel - [PATCH 02/21] ftrace: Make ftrace_is

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Message-Id: <1403530175-29217-2-git-send-email-jslaby@suse.cz>
Date:	Mon, 23 Jun 2014 15:29:16 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	linux-kernel@...r.kernel.org
Cc:	jirislaby@...il.com, Vojtech Pavlik <vojtech@...e.cz>,
	Jiri Kosina <jkosina@...e.cz>, Jiri Slaby <jslaby@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: [PATCH 02/21] ftrace: Make ftrace_is_dead available globally

Kgr wants to test whether ftrace is OK with patching. If not, we just
bail out and will not initialize at all.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
---
 include/linux/ftrace.h | 3 +++
 kernel/trace/trace.h   | 2 --
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index c142816c2801..7ba30d4b4909 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -140,6 +140,8 @@ enum ftrace_tracing_type_t {
 /* Current tracing type, default is FTRACE_TYPE_ENTER */
 extern enum ftrace_tracing_type_t ftrace_tracing_type;
 
+extern int ftrace_is_dead(void);
+
 /**
  * ftrace_stop - stop function tracer.
  *
@@ -241,6 +243,7 @@ static inline int ftrace_nr_registered_ops(void)
 	return 0;
 }
 static inline void clear_ftrace_function(void) { }
+static inline int ftrace_is_dead(void) { return 0; }
 static inline void ftrace_kill(void) { }
 static inline void ftrace_stop(void) { }
 static inline void ftrace_start(void) { }
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 9258f5a815db..0d96b8990a97 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -824,7 +824,6 @@ static inline int ftrace_trace_task(struct task_struct *task)
 
 	return test_tsk_trace_trace(task);
 }
-extern int ftrace_is_dead(void);
 int ftrace_create_function_files(struct trace_array *tr,
 				 struct dentry *parent);
 void ftrace_destroy_function_files(struct trace_array *tr);
@@ -837,7 +836,6 @@ static inline int ftrace_trace_task(struct task_struct *task)
 {
 	return 1;
 }
-static inline int ftrace_is_dead(void) { return 0; }
 static inline int
 ftrace_create_function_files(struct trace_array *tr,
 			     struct dentry *parent)
-- 
2.0.0

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