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

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

On Fri, Mar 08, 2013 at 02:43:57PM -0500, Konrad Rzeszutek Wilk wrote:
> 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?

And the answer is in arch_probe_nr_irqs and determined by nr_irqs_gsi.
That data then feeds in early_irq_init which sets the bitmap.

Could you add that please in the git commit if it is not too much
trouble?
> 
> > 
> > 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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