LXR linux/kernel/stacktrace.c

   1/*
   2 * kernel/stacktrace.c
   3 *
   4 * Stack trace management functions
   5 *
   6 *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
   7 */
   8#include <linux/sched.h>
   9#include <linux/kernel.h>
  10#include <linux/export.h>
  11#include <linux/kallsyms.h>
  12#include <linux/stacktrace.h>
  13
  14void print_stack_trace(struct stack_trace *trace, int spaces)
  15{
  16        int i;
  17
  18        if (WARN_ON(!trace->entries))
  19                return;
  20
  21        for (i = 0; i < trace->nr_entries; i++) {
  22                printk("%*c", 1 + spaces, ' ');
  23                print_ip_sym(trace->entries[i]);
  24        }
  25}
  26EXPORT_SYMBOL_GPL(print_stack_trace);
  27
  28/*
  29 * Architectures that do not implement save_stack_trace_tsk or
  30 * save_stack_trace_regs get this weak alias and a once-per-bootup warning
  31 * (whenever this facility is utilized - for example by procfs):
  32 */
  33__weak void
  34save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  35{
  36        WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
  37}
  38
  39__weak void
  40save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
  41{
  42        WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.\n");
  43}
  44