linux-kernel - [Patch 2/3] Tracing/ftrace: Tracing engine depends on Nop Tracer

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Message-ID: <48D68E7E.4010902@gmail.com>
Date:	Sun, 21 Sep 2008 20:12:14 +0200
From:	Frédéric Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Steven Noonan <steven@...inklabs.net>
Subject: [Patch 2/3] Tracing/ftrace: Tracing engine depends on Nop Tracer

Now that nop tracer is used as the default tracer by replacing "none" tracer, tracing engine depends on it.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
diff -rup linux-2.6-tip (2)/kernel/trace/Kconfig linux-2.6-tip/kernel/trace/Kconfig
--- linux-2.6-tip (2)/kernel/trace/Kconfig	2008-09-19 18:01:26.000000000 +0200
+++ linux-2.6-tip/kernel/trace/Kconfig	2008-09-21 00:31:48.000000000 +0200
@@ -1,8 +1,13 @@
 #

 # Architectures that offer an FTRACE implementation should select HAVE_FTRACE:

-#

+#
+
+config NOP_TRACER

+	bool
+

 config HAVE_FTRACE

-	bool

+	bool
+	select NOP_TRACER
 

 config HAVE_DYNAMIC_FTRACE

 	bool

@@ -101,16 +106,6 @@ config SCHED_TRACER

 	  This tracer tracks the latency of the highest priority task

 	  to be scheduled in, starting from the point it has woken up.

 

-config NOP_TRACER

-	bool "NOP Tracer"

-	depends on HAVE_FTRACE

-	depends on DEBUG_KERNEL

-	select TRACING

-	help

-	  This tracer does nothing. The primary purpose for it is to

-	  politely print the output of ftrace_printk() calls without

-	  the overhead of an irrelevant trace taking place.

-

 config CONTEXT_SWITCH_TRACER

 	bool "Trace process context switches"

 	depends on HAVE_FTRACE
--
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