linux-kernel - Re: [patch 2/6] alpha: cpumask_of_node() should handle -1 as a node

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Date:	Thu, 14 Jan 2010 13:24:15 -0500
From:	Matt Turner <mattst88@...il.com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 2/6] alpha: cpumask_of_node() should handle -1 as a node

On Tue, Jan 5, 2010 at 11:55 PM, Anton Blanchard <anton@...ba.org> wrote:
> pcibus_to_node can return -1 if we cannot determine which node a pci bus
> is on. If passed -1, cpumask_of_node will negatively index the lookup array
> and pull in random data:
>
> # cat /sys/devices/pci0000:00/0000:00:01.0/local_cpus
> 00000000,00000003,00000000,00000000
> # cat /sys/devices/pci0000:00/0000:00:01.0/local_cpulist
> 64-65
>
> Change cpumask_of_node to check for -1 and return cpu_all_mask in this
> case:
>
> # cat /sys/devices/pci0000:00/0000:00:01.0/local_cpus
> ffffffff,ffffffff,ffffffff,ffffffff
> # cat /sys/devices/pci0000:00/0000:00:01.0/local_cpulist
> 0-127
>
> Signed-off-by: Anton Blanchard <anton@...ba.org>
> ---
>
> Index: linux-cpumask/arch/alpha/include/asm/topology.h
> ===================================================================
> --- linux-cpumask.orig/arch/alpha/include/asm/topology.h        2010-01-06 15:20:22.952583839 +1100
> +++ linux-cpumask/arch/alpha/include/asm/topology.h     2010-01-06 15:20:46.610083557 +1100
> @@ -28,6 +28,9 @@ static const struct cpumask *cpumask_of_
>  {
>        int cpu;
>
> +       if (node == -1)
> +               return cpu_all_mask;
> +
>        cpumask_clear(&node_to_cpumask_map[node]);
>
>        for_each_online_cpu(cpu) {
>
> --

Thanks! I've added this to alpha-2.6.

Matt
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