[MIPS] unwind_stack(): return ra if an exception occured at the first instruction

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

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 951bf9ca3ce955f02018bf4bfb46cad7aec52c35..e7b0b385fb2b6dd12b0687fef1bb45d48f206f3f 100644 (file)
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -465,8 +465,11 @@ unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
 
        if (!kallsyms_lookup(pc, &size, &ofs, &modname, namebuf))
                return 0;
-       if (ofs == 0)
-               return 0;
+       /*
+        * Return ra if an exception occured at the first instruction
+        */
+       if (unlikely(ofs == 0))
+               return ra;
 
        info.func = (void *)(pc - ofs);
        info.func_size = ofs;   /* analyze from start to ofs */