linux-kernel - [PATCH 3/5] arm: LLVMLinux: Use current_stack_pointer for return

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Date:	Fri,  6 Sep 2013 17:28:09 -0400
From:	behanw@...verseincode.com
To:	linux@....linux.org.uk
Cc:	behanw@...verseincode.com, Mark Charlebois <charlebm@...il.com>,
	Sahara <keun-o.park@...driver.com>,
	Jan-Simon Möller <dl9pf@....de>,
	Dave Martin <dave.martin@...aro.org>,
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM PORT),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 3/5] arm: LLVMLinux: Use current_stack_pointer for return_address

From: Behan Webster <behanw@...verseincode.com>

The existing code uses named registers to get the value of the stack pointer.
The new current_stack_pointer macro is more readable and allows for a central
portable implementation of how to get the stack pointer with ASM. This change
supports being able to compile the kernel with both gcc and Clang.

Signed-off-by: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Behan Webster <behanw@...verseincode.com>
Reviewed-by: Jan-Simon Möller <dl9pf@....de>
---
 arch/arm/kernel/return_address.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm/kernel/return_address.c b/arch/arm/kernel/return_address.c
index fafedd8..5bceaef 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;
 
-- 
1.8.1.2

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