Re: [PATCH] Fix per-cpu allocation on oldworld SMP powermacs

diff --git a/arch/powerpc/platforms/powermac/setup.c

b/arch/powerpc/platforms/powermac/setup.c
index 07b1c4e..c519b2a 100644

--- a/arch/powerpc/platforms/powermac/setup.c
+++ b/arch/powerpc/platforms/powermac/setup.c

@@ -363,8 +363,19 @@ static void __init pmac_setup_arch(void)
                smp_ops = &core99_smp_ops;
        }
 #ifdef CONFIG_PPC32
-       else
+       else {
+               /*
+                * We have to set bits in cpu_possible_map here since

the
+                * secondary CPU(s) aren't in the device tree, and
+                * setup_per_cpu_areas only allocates per-cpu data for
+                * CPUs in the cpu_possible_map.
+                */
+               int cpu;
+
+               for (cpu = 1; cpu < 4 && cpu < NR_CPUS; ++cpu)
+                       cpu_set(cpu, cpu_possible_map);
                smp_ops = &psurge_smp_ops;
+       }
 #endif
 #endif /* CONFIG_SMP */