1 files changed, 19 insertions, 13 deletions

diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 4e9938dee060..b1249774d1e8 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -107,7 +107,11 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
 }
 
 static int kstack_depth_to_print = 12;
+#ifdef CONFIG_STACK_UNWIND
 static int call_trace = 1;
+#else
+#define call_trace (-1)
+#endif
 
 #ifdef CONFIG_KALLSYMS
 # include <linux/kallsyms.h>
@@ -174,7 +178,7 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
                         break;
 #endif
                 default:
-                        end = per_cpu(init_tss, cpu).ist[k];
+                        end = per_cpu(orig_ist, cpu).ist[k];
                         break;
                 }
                 /*
@@ -274,21 +278,21 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s
                         if (unwind_init_blocked(&info, tsk) == 0)
                                 unw_ret = show_trace_unwind(&info, NULL);
                 }
-                if (unw_ret > 0 && !arch_unw_user_mode(&info)) {
-#ifdef CONFIG_STACK_UNWIND
-                        unsigned long rip = info.regs.rip;
-                        print_symbol("DWARF2 unwinder stuck at %s\n", rip);
-                        if (call_trace == 1) {
-                                printk("Leftover inexact backtrace:\n");
-                                stack = (unsigned long *)info.regs.rsp;
-                        } else if (call_trace > 1)
+                if (unw_ret > 0) {
+                        if (call_trace == 1 && !arch_unw_user_mode(&info)) {
+                                print_symbol("DWARF2 unwinder stuck at %s\n",
+                                             UNW_PC(&info));
+                                if ((long)UNW_SP(&info) < 0) {
+                                        printk("Leftover inexact backtrace:\n");
+                                        stack = (unsigned long *)UNW_SP(&info);
+                                } else
+                                        printk("Full inexact backtrace again:\n");
+                        } else if (call_trace >= 1)
                                 return;
                         else
                                 printk("Full inexact backtrace again:\n");
-#else
+                } else
                         printk("Inexact backtrace:\n");
-#endif
-                }
         }
 
         /*
@@ -529,7 +533,7 @@ void __kprobes oops_end(unsigned long flags)
                 /* Nest count reaches zero, release the lock. */
                 spin_unlock_irqrestore(&die_lock, flags);
         if (panic_on_oops)
-                panic("Fatal exception: panic_on_oops");
+                panic("Fatal exception");
 }
 
 void __kprobes __die(const char * str, struct pt_regs * regs, long err)
@@ -1120,6 +1124,7 @@ static int __init kstack_setup(char *s)
 }
 __setup("kstack=", kstack_setup);
 
+#ifdef CONFIG_STACK_UNWIND
 static int __init call_trace_setup(char *s)
 {
         if (strcmp(s, "old") == 0)
@@ -1133,3 +1138,4 @@ static int __init call_trace_setup(char *s)
         return 1;
 }
 __setup("call_trace=", call_trace_setup);
+#endif