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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 11/02/15 14:50, Vijay Kilari wrote:
> 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)

What do you think is incorrect about it?

~Andrew

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