linux-kernel - Re: [PATCH] pci/intr_remapping: allocate irq

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Message-Id: <1249406368.27006.10789.camel@localhost.localdomain>
Date:	Tue, 04 Aug 2009 10:19:28 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] pci/intr_remapping: allocate irq_iommu on node

On Tue, 2009-08-04 at 09:04 -0700, Yinghai Lu wrote:
> make it use node from irq_desc.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  drivers/pci/intr_remapping.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6/drivers/pci/intr_remapping.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/intr_remapping.c
> +++ linux-2.6/drivers/pci/intr_remapping.c
> @@ -201,7 +201,7 @@ int alloc_irte(struct intel_iommu *iommu
>  	for (i = index; i < index + count; i++)
>  		table->base[i].present = 1;
>  
> -	irq_iommu = irq_2_iommu_alloc(irq);
> +	irq_iommu = irq_2_iommu_alloc_node(irq, irq_to_desc(irq)->node);

As far as I can see, this node will always be boot_cpu_id's node. We
allocate the IRTE at the time of the create_irq() and at that time,
desc->node will always be of the boot_cpu_id's.

Can you please elaborate when this node will be different to make this
an effective patch?

thanks,
suresh

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