clockevents: prevent cpu online to interfere with nohz
[linux-2.6.git] / kernel / time / tick-common.c
index 019315e..b523d09 100644 (file)
@@ -33,7 +33,7 @@ DEFINE_PER_CPU(struct tick_device, tick_cpu_device);
  */
 ktime_t tick_next_period;
 ktime_t tick_period;
-int tick_do_timer_cpu __read_mostly = -1;
+int tick_do_timer_cpu __read_mostly = TICK_DO_TIMER_BOOT;
 DEFINE_SPINLOCK(tick_device_lock);
 
 /*
@@ -148,7 +148,7 @@ static void tick_setup_device(struct tick_device *td,
                 * If no cpu took the do_timer update, assign it to
                 * this cpu:
                 */
-               if (tick_do_timer_cpu == -1) {
+               if (tick_do_timer_cpu == TICK_DO_TIMER_BOOT) {
                        tick_do_timer_cpu = cpu;
                        tick_next_period = ktime_get();
                        tick_period = ktime_set(0, NSEC_PER_SEC / HZ);
@@ -300,7 +300,8 @@ static void tick_shutdown(unsigned int *cpup)
        if (*cpup == tick_do_timer_cpu) {
                int cpu = first_cpu(cpu_online_map);
 
-               tick_do_timer_cpu = (cpu != NR_CPUS) ? cpu : -1;
+               tick_do_timer_cpu = (cpu != NR_CPUS) ? cpu :
+                       TICK_DO_TIMER_NONE;
        }
        spin_unlock_irqrestore(&tick_device_lock, flags);
 }