/*
   * kernel/stacktrace.c
   *
   * Stack trace management functions
   *
   *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
   */
  #include <linux/sched.h>

  #include <linux/kernel.h>

  #include <linux/export.h>

  #include <linux/kallsyms.h>
  #include <linux/stacktrace.h>
  
  void print_stack_trace(struct stack_trace *trace, int spaces)
  {

  	int i;

  	if (WARN_ON(!trace->entries))
  		return;

  	for (i = 0; i < trace->nr_entries; i++) {

  		printk("%*c", 1 + spaces, ' ');
  		print_ip_sym(trace->entries[i]);

  	}
  }

  EXPORT_SYMBOL_GPL(print_stack_trace);

  /*

   * Architectures that do not implement save_stack_trace_tsk or
   * save_stack_trace_regs get this weak alias and a once-per-bootup warning
   * (whenever this facility is utilized - for example by procfs):

   */
  __weak void
  save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  {
  	WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.
  ");
  }

  
  __weak void
  save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
  {
  	WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.
  ");
  }