From: Behan Webster <behanw@converseincode.com>
Date: Fri, 26 Sep 2014 23:31:07 +0000 (+0100)
Subject: ARM: 8171/1: Use current_stack_pointer for return_address
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=a556ee1247b99720d9ba6d8a3ed43dd960575d07;p=deliverable%2Flinux.git

ARM: 8171/1: Use current_stack_pointer for return_address

Use the global current_stack_pointer to get the value of the stack pointer.
This change supports being able to compile the kernel with both gcc and Clang.

Signed-off-by: Behan Webster <behanw@converseincode.com>
Reviewed-by: Mark Charlebois <charlebm@gmail.com>
Reviewed-by: Jan-Simon Möller <dl9pf@gmx.de>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/kernel/return_address.c b/arch/arm/kernel/return_address.c
index 98ea4b7eb406..24b4a04846eb 100644
--- a/arch/arm/kernel/return_address.c
+++ b/arch/arm/kernel/return_address.c
@@ -39,13 +39,12 @@ void *return_address(unsigned int level)
 {
 	struct return_address_data data;
 	struct stackframe frame;
-	register unsigned long current_sp asm ("sp");
 
 	data.level = level + 2;
 	data.addr = NULL;
 
 	frame.fp = (unsigned long)__builtin_frame_address(0);
-	frame.sp = current_sp;
+	frame.sp = current_stack_pointer;
 	frame.lr = (unsigned long)__builtin_return_address(0);
 	frame.pc = (unsigned long)return_address;