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

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Message-Id: <20100106045525.207405499@samba.org>
Date:	Wed, 06 Jan 2010 15:55:13 +1100
From:	Anton Blanchard <anton@...ba.org>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [patch 4/6] mips: 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@...ba.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 *);
 

-- 

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