printk(KERN_ALERT "test end\n");
}
+static void do_test_int(void)
+{
+ long flags;
+ unsigned int i;
+ cycles_t time1, time2, time;
+ long rem;
+
+ local_irq_save(flags);
+ preempt_disable();
+ time1 = get_cycles();
+ for (i = 0; i < NR_LOOPS; i++) {
+ local_irq_restore(flags);
+ local_irq_save(flags);
+ }
+ time2 = get_cycles();
+ local_irq_restore(flags);
+ preempt_enable();
+ time = time2 - time1;
+
+ printk(KERN_ALERT "test results: time for disabling/enabling interrupts (STI/CLI)\n");
+ printk(KERN_ALERT "number of loops: %d\n", NR_LOOPS);
+ printk(KERN_ALERT "total time: %llu\n", time);
+ time = div_long_long_rem(time, NR_LOOPS, &rem);
+ printk(KERN_ALERT "-> enabling/disabling interrupts (STI/CLI) takes %llu cycles\n",
+ time);
+ printk(KERN_ALERT "test end\n");
+}
+
static int ltt_test_init(void)
do_test_cmpxchg();
do_test_enable_int();
do_test_disable_int();
+ do_test_int();
return -EAGAIN; /* Fail will directly unload the module */
}