cpumask: Alpha: Introduce cpumask_of_node to replace node_to_cpumask()

I'm not sure the existing code even compiles, but new version is
straightforward.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 arch/alpha/include/asm/topology.h |   16 ++++++++++++++++
 arch/alpha/kernel/setup.c         |    5 +++++
 2 files changed, 21 insertions(+)

diff -r 7c560fea91d7 arch/alpha/include/asm/topology.h
--- a/arch/alpha/include/asm/topology.h	Fri Nov 07 10:26:17 2008 +1100
+++ b/arch/alpha/include/asm/topology.h	Fri Nov 07 10:38:10 2008 +1100
@@ -39,6 +39,22 @@ static inline cpumask_t node_to_cpumask(
 	return node_cpu_mask;
 }
 
+extern struct cpumask node_to_cpumask_map[];
+/* FIXME: This is dumb, recalculating every time.  But simple. */
+static const struct cpumask *cpumask_of_node(int node)
+{
+	int cpu;
+
+	cpumask_clear(&node_to_cpumask_map[node]);
+
+	for_each_online_cpu(cpu) {
+		if (cpu_to_node(cpu) == node)
+			cpumask_set_cpu(cpu, node_to_cpumask_map[node]);
+	}
+
+	return &node_to_cpumask_map[node];
+}
+
 #define pcibus_to_cpumask(bus)	(cpu_online_map)
 
 #endif /* !CONFIG_NUMA */
diff -r 7c560fea91d7 arch/alpha/kernel/setup.c
--- a/arch/alpha/kernel/setup.c	Fri Nov 07 10:26:17 2008 +1100
+++ b/arch/alpha/kernel/setup.c	Fri Nov 07 10:38:10 2008 +1100
@@ -77,6 +77,11 @@ int alpha_l3_cacheshape;
 /* 0=minimum, 1=verbose, 2=all */
 /* These can be overridden via the command line, ie "verbose_mcheck=2") */
 unsigned long alpha_verbose_mcheck = CONFIG_VERBOSE_MCHECK_ON;
+#endif
+
+#ifdef CONFIG_NUMA
+struct cpumask node_to_cpumask_map[MAX_NUMNODES] __read_mostly;
+EXPORT_SYMBOL(node_to_cpumask_map);
 #endif
 
 /* Which processor we booted from.  */