return err;
}
+static int timer_mode;
+
static int __init oprofile_init(void)
{
int err;
+ /* always init architecture to setup backtrace support */
err = oprofile_arch_init(&oprofile_ops);
- if (err < 0 || timer) {
- printk(KERN_INFO "oprofile: using timer interrupt.\n");
+
+ timer_mode = err || timer; /* fall back to timer mode on errors */
+ if (timer_mode) {
+ if (!err)
+ oprofile_arch_exit();
err = oprofile_timer_init(&oprofile_ops);
if (err)
return err;
}
- return oprofilefs_register();
+
+ err = oprofilefs_register();
+ if (!err)
+ return 0;
+
+ /* failed */
+ if (timer_mode)
+ oprofile_timer_exit();
+ else
+ oprofile_arch_exit();
+
+ return err;
}
static void __exit oprofile_exit(void)
{
- oprofile_timer_exit();
oprofilefs_unregister();
- oprofile_arch_exit();
+ if (timer_mode)
+ oprofile_timer_exit();
+ else
+ oprofile_arch_exit();
}
ops->start = oprofile_hrtimer_start;
ops->stop = oprofile_hrtimer_stop;
ops->cpu_type = "timer";
+ printk(KERN_INFO "oprofile: using timer interrupt.\n");
return 0;
}