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    Subject[patch -mm 10/28] highres: Improve debug output
    From: Ingo Molnar <mingo@elte.hu>

    Add some more debug information to the hrtimer and clock events code.

    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

    ---
    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;
    --

    -
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