Commit f21f237c authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'timers-fixes-for-linus' of... 

Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  timers: handle HRTIMER_CB_IRQSAFE_UNLOCKED correctly from softirq context
  nohz: disable tick_nohz_kick_tick() for now
  irq: call __irq_enter() before calling the tick_idle_check
  x86: HPET: enter hpet_interrupt_handler with interrupts disabled
  x86: HPET: read from HPET_Tn_CMP() not HPET_T0_CMP
  x86: HPET: convert WARN_ON to WARN_ON_ONCE
parents 2f96cb57 5d5254f0

arch/x86/kernel/hpet.c

+2 −2
Original line number Diff line number Diff line
@@ -322,7 +322,7 @@ static int hpet_next_event(unsigned long delta, 
	 * what we wrote hit the chip before we compare it to the

	 * counter.

	 */

	WARN_ON((u32)hpet_readl(HPET_T0_CMP) != cnt);

	WARN_ON_ONCE((u32)hpet_readl(HPET_Tn_CMP(timer)) != cnt);



	return (s32)((u32)hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0;

}
@@ -445,7 +445,7 @@ static int hpet_setup_irq(struct hpet_dev *dev) 
{



	if (request_irq(dev->irq, hpet_interrupt_handler,

			IRQF_SHARED|IRQF_NOBALANCING, dev->name, dev))

			IRQF_DISABLED|IRQF_NOBALANCING, dev->name, dev))

		return -1;



	disable_irq(dev->irq);

kernel/hrtimer.c

+16 −1
Original line number Diff line number Diff line
@@ -1209,6 +1209,7 @@ static void run_hrtimer_pending(struct hrtimer_cpu_base *cpu_base) 
		enum hrtimer_restart (*fn)(struct hrtimer *);

		struct hrtimer *timer;

		int restart;

		int emulate_hardirq_ctx = 0;



		timer = list_entry(cpu_base->cb_pending.next,

				   struct hrtimer, cb_entry);
@@ -1217,9 +1218,23 @@ static void run_hrtimer_pending(struct hrtimer_cpu_base *cpu_base) 
		timer_stats_account_hrtimer(timer);



		fn = timer->function;

		/*

		 * A timer might have been added to the cb_pending list

		 * when it was migrated during a cpu-offline operation.

		 * Emulate hardirq context for such timers.

		 */

		if (timer->cb_mode == HRTIMER_CB_IRQSAFE_PERCPU ||

		    timer->cb_mode == HRTIMER_CB_IRQSAFE_UNLOCKED)

			emulate_hardirq_ctx = 1;



		__remove_hrtimer(timer, timer->base, HRTIMER_STATE_CALLBACK, 0);

		spin_unlock_irq(&cpu_base->lock);



		if (unlikely(emulate_hardirq_ctx)) {

			local_irq_disable();

			restart = fn(timer);

			local_irq_enable();

		} else

			restart = fn(timer);



		spin_lock_irq(&cpu_base->lock);

kernel/softirq.c

+4 −3
Original line number Diff line number Diff line
@@ -269,9 +269,10 @@ void irq_enter(void) 
{

	int cpu = smp_processor_id();



	if (idle_cpu(cpu) && !in_interrupt())

	if (idle_cpu(cpu) && !in_interrupt()) {

		__irq_enter();

		tick_check_idle(cpu);



	} else

		__irq_enter();

}

kernel/time/tick-sched.c

+4 −0
Original line number Diff line number Diff line
@@ -568,6 +568,9 @@ static void tick_nohz_switch_to_nohz(void) 
 */

static void tick_nohz_kick_tick(int cpu)

{

#if 0

	/* Switch back to 2.6.27 behaviour */



	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);

	ktime_t delta, now;
@@ -584,6 +587,7 @@ static void tick_nohz_kick_tick(int cpu) 
		return;



	tick_nohz_restart(ts, now);

#endif

}



#else

CRA Git | Maintained and supported by SUSTech CRA and CCSE