powerpc/pmac: Fix SMP kernels on pre-core99 UP machines

The code for "powersurge" SMP would kick in and cause a crash
at boot due to the lack of a NULL test.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
index e6f7378f4a49240720d2a1ce5aebbd043af6ef10..44d769258ebf08d1b5ba40641b4687827f1c32d0 100644 (file)
--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -414,7 +414,7 @@ static struct irqaction psurge_irqaction = {
 
 static void __init smp_psurge_setup_cpu(int cpu_nr)
 {
-       if (cpu_nr != 0)
+       if (cpu_nr != 0 || !psurge_start)
                return;
 
        /* reset the entry point so if we get another intr we won't