linux-kernel - [PATCH 4/6] arm: LLVMLinux: Use current_stack_pointer in save_stack_trace

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Message-Id: <1404850576-2006-5-git-send-email-behanw@converseincode.com>
Date:	Tue,  8 Jul 2014 13:16:14 -0700
From:	behanw@...verseincode.com
To:	anurag19aggarwal@...il.com, catalin.marinas@....com,
	charlebm@...il.com, dave.long@...aro.org, k.khlebnikov@...sung.com,
	linux@....linux.org.uk, linyongting@...il.com,
	Nikolay.Borisov@....com, tglx@...utronix.de,
	u.kleine-koenig@...gutronix.de, will.deacon@....com
Cc:	behanw@...verseincode.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, rabin@....in, rostedt@...dmis.org,
	dwmw2@...radead.org
Subject: [PATCH 4/6] arm: LLVMLinux: Use current_stack_pointer in save_stack_trace_tsk

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

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@...verseincode.com>
Signed-off-by: Mark Charlebois <charlebm@...il.com>
Reviewed-by: Jan-Simon M??ller <dl9pf@....de>
---
 arch/arm/kernel/stacktrace.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c
index f065eb0..92b7237 100644
--- a/arch/arm/kernel/stacktrace.c
+++ b/arch/arm/kernel/stacktrace.c
@@ -134,12 +134,10 @@ static noinline void __save_stack_trace(struct task_struct *tsk,
 		frame.pc = thread_saved_pc(tsk);
 #endif
 	} else {
-		register unsigned long current_sp asm ("sp");
-
 		/* We don't want this function nor the caller */
 		data.skip += 2;
 		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)__save_stack_trace;
 	}
-- 
1.9.1

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