Since not need 'max_cpus' after the related commit, the related code
are useless too, need be removed.
The related commit:
  
c1aa687 powerpc: Clean up obsolete code relating to decrementer and timebase
The related warning:
  arch/powerpc/kernel/smp.c:323:43: warning: parameter ‘max_cpus’ set but not used [-Wunused-but-set-parameter]
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
        cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid));
        cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid));
 
-       if (smp_ops)
-               if (smp_ops->probe)
-                       max_cpus = smp_ops->probe();
-               else
-                       max_cpus = NR_CPUS;
-       else
-               max_cpus = 1;
+       if (smp_ops && smp_ops->probe)
+               smp_ops->probe();
 }
 
 void smp_prepare_boot_cpu(void)