From: Behan Webster <behanw@converseincode.com>
Date: Wed, 27 Aug 2014 04:29:30 +0000 (+0100)
Subject: arm64: LLVMLinux: Use current_stack_pointer in save_stack_trace_tsk
X-Git-Tag: firefly_0821_release~3680^2~30^2^2~7
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9b2ff971ff9b5d88712078c6ebafb1d85e1469d7;p=firefly-linux-kernel-4.4.55.git

arm64: LLVMLinux: Use current_stack_pointer in save_stack_trace_tsk

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>
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Reviewed-by: Jan-Simon Möller <dl9pf@gmx.de>
Reviewed-by: Olof Johansson <olof@lixom.net>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from commit bb28cec4ea2f5151c08e061c6de825a8c853bbd6)
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 38f0558f0c0a..6f44bf97e4cf 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -111,10 +111,9 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
 		frame.sp = thread_saved_sp(tsk);
 		frame.pc = thread_saved_pc(tsk);
 	} else {
-		register unsigned long current_sp asm("sp");
 		data.no_sched_functions = 0;
 		frame.fp = (unsigned long)__builtin_frame_address(0);
-		frame.sp = current_sp;
+		frame.sp = current_stack_pointer;
 		frame.pc = (unsigned long)save_stack_trace_tsk;
 	}