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    Subject[PATCH 1/2] trace,x86: Add tracepoint to x86 timer interrupt handler
    Date
    The x86 timer interrupt handler is the only handler not traced in the
    irq/irq_handler_{entry|exit} trace events.

    Add tracepoints to the interrupt handler to trace it.

    Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
    ---
    arch/x86/kernel/time.c | 15 +++++++++------
    1 files changed, 9 insertions(+), 6 deletions(-)

    diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
    index 5a64d05..74d2280 100644
    --- a/arch/x86/kernel/time.c
    +++ b/arch/x86/kernel/time.c
    @@ -51,6 +51,13 @@ unsigned long profile_pc(struct pt_regs *regs)
    }
    EXPORT_SYMBOL(profile_pc);

    +static irqreturn_t timer_interrupt(int irq, void *dev_id);
    +static struct irqaction irq0 = {
    + .handler = timer_interrupt,
    + .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
    + .name = "timer"
    +};
    +
    /*
    * Default timer interrupt handler for PIT/HPET
    */
    @@ -59,7 +66,9 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
    /* Keep nmi watchdog up to date */
    inc_irq_stat(irq0_irqs);

    + trace_irq_handler_entry(irq, &irq0);
    global_clock_event->event_handler(global_clock_event);
    + trace_irq_handler_exit(irq, &irq0, 1);

    /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
    if (MCA_bus)
    @@ -68,12 +77,6 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
    return IRQ_HANDLED;
    }

    -static struct irqaction irq0 = {
    - .handler = timer_interrupt,
    - .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
    - .name = "timer"
    -};
    -
    void __init setup_default_timer_irq(void)
    {
    setup_irq(0, &irq0);
    --
    1.7.3.1


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