[TRIVIAL PATCH] Use valid node number when unmapping CPUs

[Matthew Dobson]

The cpu_2_node array for i386 is initialized to 0 for each CPU, 
effectively mapping all CPUs to node 0 unless changed.  When we unmap 
CPUs, however, we stick a -1 in the array, mapping the CPU to an invalid 
node.  This really isn't helpful.  We should map the CPU to node 0, to 
make sure that callers of cpu_to_node() and friends aren't returned a 
bogus node number.  This trivial patch changes the unmapping code to 
place a 0 in the node mapping for removed CPUs.

Cheers!

-Matt
diff -Nurp --exclude-from=/home/mcd/.dontdiff linux-2.6.0-vanilla/arch/i386/kernel/smpboot.c linux-2.6.0-patched/arch/i386/kernel/smpboot.c
--- linux-2.6.0-vanilla/arch/i386/kernel/smpboot.c	Wed Dec 17 18:58:49 2003
+++ linux-2.6.0-patched/arch/i386/kernel/smpboot.c	Thu Dec 18 14:36:06 2003
@@ -520,7 +520,7 @@ static inline void unmap_cpu_to_node(int
 	printk("Unmapping cpu %d from all nodes\n", cpu);
 	for (node = 0; node < MAX_NUMNODES; node ++)
 		cpu_clear(cpu, node_2_cpu_mask[node]);
-	cpu_2_node[cpu] = -1;
+	cpu_2_node[cpu] = 0;
 }
 #else /* !CONFIG_NUMA */