Re: [PATCH] x86, apic: Add apic calibration hook.

[Thomas Gleixner]

On Wed, 18 Aug 2010, Alok Kataria wrote:
>  
> +static void __init initialize_lapic_clkevt(long delta)
> +{
> +	/* Calculate the scaled math multiplication factor */
> +	lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> +				       lapic_clockevent.shift);
> +	lapic_clockevent.max_delta_ns =
> +		clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> +	lapic_clockevent.min_delta_ns =
> +		clockevent_delta2ns(0xF, &lapic_clockevent);
> +}
> +
>  static int __init calibrate_APIC_clock(void)
>  {
> +	apic_calibration_res = x86_init.timers.calibrate_apic();
> +	if (apic_calibration_res) {
> +		struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> +		long delta;
> +
> +		if (lapic_clockevent.mult)
> +			return 0;

  Why is this necessary ? calibrate_APIC_clock() is only called once.

Thanks,

	tglx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/