Re: [Xen-devel] [PATCH v2 15/26] xen, irq: call irq_realloc_desc_at() at first

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Feb 08, 2013 at 11:28:12AM -0800, Yinghai Lu wrote:
> We will pre-reserve irq for all gsi at first for x86, so we have to
> use realloc with it.

Where are the GSI's pre-allocated?

> 
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> ---
>  drivers/xen/events.c |    8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/xen/events.c b/drivers/xen/events.c
> index 0be4df3..dda38db 100644
> --- a/drivers/xen/events.c
> +++ b/drivers/xen/events.c
> @@ -482,8 +482,12 @@ static int __must_check xen_allocate_irq_gsi(unsigned 
> gsi)
>       /* Legacy IRQ descriptors are already allocated by the arch. */
>       if (gsi < NR_IRQS_LEGACY)
>               irq = gsi;
> -     else
> -             irq = irq_alloc_desc_at(gsi, -1);
> +     else {
> +             /* for x86, irq already get reserved for gsi */
> +             irq = irq_realloc_desc_at(gsi, -1);
> +             if (irq < 0)
> +                     irq = irq_alloc_desc_at(gsi, -1);
> +     }
>  
>       xen_irq_init(irq);
>  
> -- 
> 1.7.10.4
> 

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