[Xen-devel] Query: Boot time allocation of irq descriptors

[Vijay Kilari <vijay.kilari@xxxxxxxxx>]

Hi ,

  I just glaced at the x86 code, here nr_irqs are set to 1024, which includes
normal irq's and MSI's. Memory for these descriptors are allocated at boot time.
is it correct?

int __init init_irq_data(void)
{

...
    for (vector = 0; vector < NR_VECTORS; ++vector)
        this_cpu(vector_irq)[vector] = INT_MIN;

    irq_desc = xzalloc_array(struct irq_desc, nr_irqs);

...
}


In xen/include/asm-x86/irq.h

#define MSI_IRQ(irq)       ((irq) >= nr_irqs_gsi && (irq) < nr_irqs)


Regards
Vijay

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