[MIPS] Fix build error if CONFIG_KALLSYMS is undefined.

  CC      arch/mips/kernel/traps.o
arch/mips/kernel/traps.c: In function 'show_backtrace':
arch/mips/kernel/traps.c:110: warning: unused variable 'ra'

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/asm-mips/stacktrace.h b/include/asm-mips/stacktrace.h
index 07f873351a86..87bd7caec1cf 100644
--- a/include/asm-mips/stacktrace.h
+++ b/include/asm-mips/stacktrace.h
@@ -9,7 +9,10 @@ extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
                                   unsigned long pc, unsigned long *ra);
 #else
 #define raw_show_trace 1
-#define unwind_stack(task, sp, pc, ra)  0
+static inline unsigned long unwind_stack(struct task_struct *task,
+        unsigned long *sp, unsigned long pc, unsigned long *ra)
+{
+}
 #endif
 
 static __always_inline void prepare_frametrace(struct pt_regs *regs)