linux-kernel - [PATCH 3/3] tracing: Tracers that use CALLER_ADDR macros should select FRAME

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Date:	Sat, 2 May 2009 04:14:25 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <srostedt@...hat.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] tracing: Tracers that use CALLER_ADDR macros should
	select FRAME_POINTER

Irqsoff, switch and preempt tracers use CALLER_ADDR macros, so they
should select FRAME_POINTER. Otherwise traces are meaningless.

Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
---
 kernel/trace/Kconfig |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 450d3c2..ad44791 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -122,6 +122,7 @@ config IRQSOFF_TRACER
 	select TRACE_IRQFLAGS
 	select TRACING
 	select TRACER_MAX_TRACE
+	select FRAME_POINTER
 	help
 	  This option measures the time spent in irqs-off critical
 	  sections, with microsecond accuracy.
@@ -143,6 +144,7 @@ config PREEMPT_TRACER
 	depends on PREEMPT
 	select TRACING
 	select TRACER_MAX_TRACE
+	select FRAME_POINTER
 	help
 	  This option measures the time spent in preemption off critical
 	  sections, with microsecond accuracy.
@@ -171,6 +173,7 @@ config SCHED_TRACER
 	select TRACING
 	select CONTEXT_SWITCH_TRACER
 	select TRACER_MAX_TRACE
+	select FRAME_POINTER
 	help
 	  This tracer tracks the latency of the highest priority task
 	  to be scheduled in, starting from the point it has woken up.
-- 
1.6.2.2
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