ARM: 8176/1: Use current_stack_pointer in unwind_backtrace

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/unwind.c b/arch/arm/kernel/unwind.c
index cbb85c5..0bee233 100644 (file)
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -471,7 +471,6 @@ int unwind_frame(struct stackframe *frame)
 void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk)
 {
        struct stackframe frame;
-       register unsigned long current_sp asm ("sp");
 
        pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
 
@@ -485,7 +484,7 @@ void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk)
                        frame.pc = regs->ARM_lr;
        } else if (tsk == current) {
                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)unwind_backtrace;
        } else {