[MIPS] Simplify dump_stack()

Make dump_stack() code not depend on CONFIG_KALLSYMS.

It also make prepare_frametrace() always inlined to get
less false entries reported by show_raw_backtrace().

Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 9 insertions, 11 deletions

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 549cbb8209a3..303f00843021 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -158,7 +158,7 @@ static void show_stacktrace(struct task_struct *task, struct pt_regs *regs)
         show_backtrace(task, regs);
 }
 
-static noinline void prepare_frametrace(struct pt_regs *regs)
+static __always_inline void prepare_frametrace(struct pt_regs *regs)
 {
         __asm__ __volatile__(
                 "1: la $2, 1b\n\t"
@@ -200,17 +200,15 @@ void show_stack(struct task_struct *task, unsigned long *sp)
  */
 void dump_stack(void)
 {
-        unsigned long stack;
+        struct pt_regs regs;
 
-#ifdef CONFIG_KALLSYMS
-        if (!raw_show_trace) {
-                struct pt_regs regs;
-                prepare_frametrace(&regs);
-                show_backtrace(current, &regs);
-                return;
-        }
-#endif
-        show_raw_backtrace(&stack);
+        /*
+         * Remove any garbage that may be in regs (specially func
+         * addresses) to avoid show_raw_backtrace() to report them
+         */
+        memset(&regs, 0, sizeof(regs));
+        prepare_frametrace(&regs);
+        show_backtrace(current, &regs);
 }
 
 EXPORT_SYMBOL(dump_stack);