On Fri, 19 Dec 2008, Dimitri Sivanich wrote:
quoted text
> This patch allocates a system interrupt vector for platform specific use
> in implementing timer interrupts.

Why is this restricted to timer interrupts. That's simply a dynamic
allocation of an interrupt vector.
 
quoted text
> +
> +/* Function pointer for generic timer interrupt handling */
> +static void (*generic_timer_interrupt_extension)(void);
> +
> +int
> +register_generic_timer_extension(void (*fn)(void))

One line. All over the place.

quoted text
> +{
> +	if (generic_timer_interrupt_extension)
> +		return 1;

  -EBUSY perhaps ?

quoted text
> +	generic_timer_interrupt_extension = fn;
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(register_generic_timer_extension);
> +
> +void
> +unregister_generic_timer_extension(void)
> +{
> +	if (generic_timer_interrupt_extension)
> +		generic_timer_interrupt_extension = NULL;
> +}
> +EXPORT_SYMBOL_GPL(unregister_generic_timer_extension);
> +
> +void smp_generic_timer_interrupt(struct pt_regs *regs)
> +{
> +	struct pt_regs *old_regs = set_irq_regs(regs);
> +
> +	ack_APIC_irq();
> +
> +	exit_idle();
> +
> +	irq_enter();
> +
> +	if (generic_timer_interrupt_extension)
> +		generic_timer_interrupt_extension();

  interrupt statistics are missing. 

quoted text
> +	irq_exit();
> +
> +	set_irq_regs(old_regs);
> +}
> +

Thanks,

	tglx
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