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powerpc: cpumask_of_node() should handle -1 as a node 

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@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-01-05 18:55:10 +00:00 committed by Benjamin Herrenschmidt
parent 46150a050f
commit c81b812a33
1 changed files with 3 additions and 1 deletions
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4
arch/powerpc/include/asm/topology.h
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@ -17,7 +17,9 @@ static inline int cpu_to_node(int cpu)
#define parent_node(node) (node)
#define cpumask_of_node(node) (&numa_cpumask_lookup_table[node])
#define cpumask_of_node(node) ((node) == -1 ? \
cpu_all_mask : \
&numa_cpumask_lookup_table[node])
int of_node_to_nid(struct device_node *device);