linux-kernel - [PATCH 1/2] arm: fix returning wrong CALLER

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Message-Id: <1357207949-3349-1-git-send-email-kpark3469@gmail.com>
Date:	Thu,  3 Jan 2013 19:12:28 +0900
From:	kpark3469@...il.com
To:	rostedt@...dmis.org
Cc:	fweisbec@...il.com, mingo@...hat.com, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	sahara <keun-o.park@...driver.com>
Subject: [PATCH 1/2] arm: fix returning wrong CALLER_ADDRx

From: sahara <keun-o.park@...driver.com>

This makes return_address return correct value for ftrace feature.
unwind_frame does not update frame->lr but frame->pc for backtrace.
And, the initialization for data.addr was missing so that wrong value
returned when unwind_frame failed.

Signed-off-by: sahara <keun-o.park@...driver.com>
---
 arch/arm/kernel/return_address.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/return_address.c b/arch/arm/kernel/return_address.c
index 8085417..fafedd8 100644
--- a/arch/arm/kernel/return_address.c
+++ b/arch/arm/kernel/return_address.c
@@ -26,7 +26,7 @@ static int save_return_addr(struct stackframe *frame, void *d)
 	struct return_address_data *data = d;
 
 	if (!data->level) {
-		data->addr = (void *)frame->lr;
+		data->addr = (void *)frame->pc;
 
 		return 1;
 	} else {
@@ -41,7 +41,8 @@ void *return_address(unsigned int level)
 	struct stackframe frame;
 	register unsigned long current_sp asm ("sp");
 
-	data.level = level + 1;
+	data.level = level + 2;
+	data.addr = NULL;
 
 	frame.fp = (unsigned long)__builtin_frame_address(0);
 	frame.sp = current_sp;
-- 
1.7.1

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