arch/x86/kernel/stacktrace.c

   1 /*
   2  * Stack trace management functions
   3  *
   4  *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
   5  */
   6 #include <linux/sched.h>
   7 #include <linux/stacktrace.h>
   8 #include <linux/module.h>
   9 #include <asm/stacktrace.h>
  10
  11 static void save_stack_warning(void *data, char *msg)
  12 {
  13 }
  14
  15 static void
  16 save_stack_warning_symbol(void *data, char *msg, unsigned long symbol)
  17 {
  18 }
  19
  20 static int save_stack_stack(void *data, char *name)
  21 {
  22         return -1;
  23 }
  24
  25 static void save_stack_address(void *data, unsigned long addr, int reliable)
  26 {
  27         struct stack_trace *trace = data;
  28 <<<<<<< HEAD:arch/x86/kernel/stacktrace.c
  29 =======
  30         if (!reliable)
  31                 return;
  32 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/stacktrace.c
  33         if (trace->skip > 0) {
  34                 trace->skip--;
  35                 return;
  36         }
  37         if (trace->nr_entries < trace->max_entries)
  38                 trace->entries[trace->nr_entries++] = addr;
  39 }
  40
  41 static void
  42 save_stack_address_nosched(void *data, unsigned long addr, int reliable)
  43 {
  44         struct stack_trace *trace = (struct stack_trace *)data;
  45 <<<<<<< HEAD:arch/x86/kernel/stacktrace.c
  46 =======
  47         if (!reliable)
  48                 return;
  49 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/stacktrace.c
  50         if (in_sched_functions(addr))
  51                 return;
  52         if (trace->skip > 0) {
  53                 trace->skip--;
  54                 return;
  55         }
  56         if (trace->nr_entries < trace->max_entries)
  57                 trace->entries[trace->nr_entries++] = addr;
  58 }
  59
  60 static const struct stacktrace_ops save_stack_ops = {
  61         .warning = save_stack_warning,
  62         .warning_symbol = save_stack_warning_symbol,
  63         .stack = save_stack_stack,
  64         .address = save_stack_address,
  65 };
  66
  67 static const struct stacktrace_ops save_stack_ops_nosched = {
  68         .warning = save_stack_warning,
  69         .warning_symbol = save_stack_warning_symbol,
  70         .stack = save_stack_stack,
  71         .address = save_stack_address_nosched,
  72 };
  73
  74 /*
  75  * Save stack-backtrace addresses into a stack_trace buffer.
  76  */
  77 void save_stack_trace(struct stack_trace *trace)
  78 {
  79         dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace);
  80         if (trace->nr_entries < trace->max_entries)
  81                 trace->entries[trace->nr_entries++] = ULONG_MAX;
  82 }
  83
  84 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  85 {
  86         dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);
  87         if (trace->nr_entries < trace->max_entries)
  88                 trace->entries[trace->nr_entries++] = ULONG_MAX;
  89 }