[patch 4/6] mips: cpumask_of_node() should handle -1 as a node

Anton Blanchard
2010-01-06T06:10:44Z

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>
---

Index: linux-cpumask/arch/mips/include/asm/mach-ip27/topology.h
===================================================================
--- linux-cpumask.orig/arch/mips/include/asm/mach-ip27/topology.h 2010-01-06 15:20:22.872583883 +1100
+++ linux-cpumask/arch/mips/include/asm/mach-ip27/topology.h 2010-01-06 15:20:47.310083709 +1100
@@ -24,7 +24,9 @@ extern struct cpuinfo_ip27 sn_cpu_info[N

#define cpu_to_node(cpu) (sn_cpu_info[(cpu)].p_nodeid)
#define parent_node(node) (node)
-#define cpumask_of_node(node) (&hub_data(node)->h_cpus)
+#define cpumask_of_node(node) ((node) == -1 ? \
+ cpu_all_mask : \
+ &hub_data(node)->h_cpus)
struct pci_bus;
extern int pcibus_to_node(struct pci_bus *);

--