linux-kernel - Re: [patch 5/6] sparc: cpumask_of_node() should handle -1 as a node

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Date:	Wed, 06 Jan 2010 20:22:31 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	anton@...ba.org
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	rusty@...tcorp.com.au, akpm@...ux-foundation.org
Subject: Re: [patch 5/6] sparc: cpumask_of_node() should handle -1 as a node

From: Anton Blanchard <anton@...ba.org>
Date: Wed, 06 Jan 2010 15:55:14 +1100

> 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>

Acked-by: David S. Miller <davem@...emloft.net>
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