From: Ingo Molnar Add some more debug information to the hrtimer and clock events code. Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/i386/kernel/apic.c | 3 +++ kernel/hrtimer.c | 5 ++++- kernel/time/tick-oneshot.c | 15 ++++++++++++++- 3 files changed, 21 insertions(+), 2 deletions(-) Index: linux-2.6.22-rc4-mm/arch/i386/kernel/apic.c =================================================================== --- linux-2.6.22-rc4-mm.orig/arch/i386/kernel/apic.c 2007-06-23 14:38:58.000000000 +0200 +++ linux-2.6.22-rc4-mm/arch/i386/kernel/apic.c 2007-06-23 14:38:58.000000000 +0200 @@ -524,6 +524,9 @@ void __init setup_boot_APIC_clock(void) */ if (nmi_watchdog != NMI_IO_APIC) lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; + else + printk(KERN_WARNING "APIC timer registered as dummy," + " due to nmi_watchdog=1!\n"); } /* Setup the lapic or request the broadcast */ Index: linux-2.6.22-rc4-mm/kernel/hrtimer.c =================================================================== --- linux-2.6.22-rc4-mm.orig/kernel/hrtimer.c 2007-06-23 14:38:56.000000000 +0200 +++ linux-2.6.22-rc4-mm/kernel/hrtimer.c 2007-06-23 14:38:58.000000000 +0200 @@ -558,7 +558,8 @@ static inline int hrtimer_enqueue_reprog */ static int hrtimer_switch_to_hres(void) { - struct hrtimer_cpu_base *base = &__get_cpu_var(hrtimer_bases); + int cpu = smp_processor_id(); + struct hrtimer_cpu_base *base = &per_cpu(hrtimer_bases, cpu); unsigned long flags; if (base->hres_active) @@ -568,6 +569,8 @@ static int hrtimer_switch_to_hres(void) if (tick_init_highres()) { local_irq_restore(flags); + printk(KERN_WARNING "Could not switch to high resolution " + "mode on CPU %d\n", cpu); return 0; } base->hres_active = 1; Index: linux-2.6.22-rc4-mm/kernel/time/tick-oneshot.c =================================================================== --- linux-2.6.22-rc4-mm.orig/kernel/time/tick-oneshot.c 2007-06-23 14:38:56.000000000 +0200 +++ linux-2.6.22-rc4-mm/kernel/time/tick-oneshot.c 2007-06-23 14:38:58.000000000 +0200 @@ -73,8 +73,21 @@ int tick_switch_to_oneshot(void (*handle struct clock_event_device *dev = td->evtdev; if (!dev || !(dev->features & CLOCK_EVT_FEAT_ONESHOT) || - !tick_device_is_functional(dev)) + !tick_device_is_functional(dev)) { + + printk(KERN_INFO "Clockevents: " + "could not switch to one-shot mode:"); + if (!dev) { + printk(" no tick device\n"); + } else { + if (!tick_device_is_functional(dev)) + printk(" %s is not functional.\n", dev->name); + else if (!(dev->features & CLOCK_EVT_FEAT_ONESHOT)) + printk(" %s does not support one-shot mode.\n", + dev->name); + } return -EINVAL; + } td->mode = TICKDEV_MODE_ONESHOT; dev->event_handler = handler; -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/