arm64: LLVMLinux: Use current_stack_pointer in kernel/traps.c

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: Olof Johansson <olof@lixom.net>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 02cd3f0..de1b085 100644 (file)
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -132,7 +132,6 @@ static void dump_instr(const char *lvl, struct pt_regs *regs)
 static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
 {
        struct stackframe frame;
-       const register unsigned long current_sp asm ("sp");
 
        pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
 
@@ -145,7 +144,7 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
                frame.pc = regs->pc;
        } else if (tsk == current) {
                frame.fp = (unsigned long)__builtin_frame_address(0);
-               frame.sp = current_sp;
+               frame.sp = current_stack_pointer;
                frame.pc = (unsigned long)dump_backtrace;
        } else {
                /*