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-rw-r--r--arch/x86_64/kernel/traps.c30
1 files changed, 18 insertions, 12 deletions
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 14052f089814..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)
107} 107}
108 108
109static int kstack_depth_to_print = 12; 109static int kstack_depth_to_print = 12;
110#ifdef CONFIG_STACK_UNWIND
110static int call_trace = 1; 111static int call_trace = 1;
112#else
113#define call_trace (-1)
114#endif
111 115
112#ifdef CONFIG_KALLSYMS 116#ifdef CONFIG_KALLSYMS
113# include <linux/kallsyms.h> 117# include <linux/kallsyms.h>
@@ -174,7 +178,7 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
174 break; 178 break;
175#endif 179#endif
176 default: 180 default:
177 end = per_cpu(init_tss, cpu).ist[k]; 181 end = per_cpu(orig_ist, cpu).ist[k];
178 break; 182 break;
179 } 183 }
180 /* 184 /*
@@ -274,21 +278,21 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s
274 if (unwind_init_blocked(&info, tsk) == 0) 278 if (unwind_init_blocked(&info, tsk) == 0)
275 unw_ret = show_trace_unwind(&info, NULL); 279 unw_ret = show_trace_unwind(&info, NULL);
276 } 280 }
277 if (unw_ret > 0 && !arch_unw_user_mode(&info)) { 281 if (unw_ret > 0) {
278#ifdef CONFIG_STACK_UNWIND 282 if (call_trace == 1 && !arch_unw_user_mode(&info)) {
279 unsigned long rip = info.regs.rip; 283 print_symbol("DWARF2 unwinder stuck at %s\n",
280 print_symbol("DWARF2 unwinder stuck at %s\n", rip); 284 UNW_PC(&info));
281 if (call_trace == 1) { 285 if ((long)UNW_SP(&info) < 0) {
282 printk("Leftover inexact backtrace:\n"); 286 printk("Leftover inexact backtrace:\n");
283 stack = (unsigned long *)info.regs.rsp; 287 stack = (unsigned long *)UNW_SP(&info);
284 } else if (call_trace > 1) 288 } else
289 printk("Full inexact backtrace again:\n");
290 } else if (call_trace >= 1)
285 return; 291 return;
286 else 292 else
287 printk("Full inexact backtrace again:\n"); 293 printk("Full inexact backtrace again:\n");
288#else 294 } else
289 printk("Inexact backtrace:\n"); 295 printk("Inexact backtrace:\n");
290#endif
291 }
292 } 296 }
293 297
294 /* 298 /*
@@ -1120,6 +1124,7 @@ static int __init kstack_setup(char *s)
1120} 1124}
1121__setup("kstack=", kstack_setup); 1125__setup("kstack=", kstack_setup);
1122 1126
1127#ifdef CONFIG_STACK_UNWIND
1123static int __init call_trace_setup(char *s) 1128static int __init call_trace_setup(char *s)
1124{ 1129{
1125 if (strcmp(s, "old") == 0) 1130 if (strcmp(s, "old") == 0)
@@ -1133,3 +1138,4 @@ static int __init call_trace_setup(char *s)
1133 return 1; 1138 return 1;
1134} 1139}
1135__setup("call_trace=", call_trace_setup); 1140__setup("call_trace=", call_trace_setup);
1141#endif